{"id":31871,"date":"2026-10-08T14:03:59","date_gmt":"2026-10-08T12:03:59","guid":{"rendered":"https:\/\/migflug.com\/?page_id=31871"},"modified":"2026-10-08T18:27:43","modified_gmt":"2026-10-08T16:27:43","slug":"on-mark","status":"publish","type":"page","link":"https:\/\/migflug.com\/cz\/aircraft-manufacturers\/on-mark\/","title":{"rendered":"On Mark Engineering"},"content":{"rendered":"<style>body.page-id-31871 h1.entry-title.main_title{display:none} body.page-id-31871 #main-content .container{padding-top:0} body.page-id-31871 #left-area{padding-bottom:0} body.page-id-31871{overflow-x:hidden} body.page-id-31871 #sidebar{display:none} body.page-id-31871 #left-area{width:100%!important;float:none;padding:0} body.page-id-31871 #main-content .container::before{display:none!important;background:none!important} html{overflow-x:hidden} #mfam{width:100vw;margin-left:calc(50% - 50vw);background:#fff;color:#14181f;line-height:1.7;font-family:'Gilroy 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.finflash{width:46px;height:46px} #mfam .rondel.wide{width:88px;height:33px} #mfam .finflash.tall{width:38px;height:46px} #mfam .mark .mk{font-size:10.5px;letter-spacing:1.7px;text-transform:uppercase;color:rgba(255,255,255,.55);line-height:1.5;font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .mark .mk b{display:block;color:#fff;letter-spacing:.2px;text-transform:none;font-size:14.5px;margin-top:2px} #mfam .statstrip .stat{border-top:3px solid var(--blue)} #mfam .statstrip .stat:first-child{border-top-color:var(--red)} #mfam table.oobt.fleet td:first-child{padding:10px 6px 10px 14px;vertical-align:top} #mfam .tthumb{display:block;width:150px;height:100px;background:#eef1f6 center\/cover no-repeat;border:1px solid var(--line)} #mfam table.oobt.fleet{table-layout:fixed;min-width:1072px} #mfam table.oobt.fleet col.c-th{width:172px} #mfam table.oobt.fleet col.c-type{width:198px} #mfam table.oobt.fleet col.c-role{width:150px} #mfam table.oobt.fleet col.c-num{width:78px} #mfam table.oobt.fleet col.c-yr{width:64px} #mfam table.oobt.fleet col.c-units{width:154px} #mfam table.oobt.fleet col.c-srv{width:104px} #mfam table.oobt.fleet col.c-rep{width:150px} #mfam table.oobt.fleet col.c-fd{width:118px} #mfam table.oobt.fleet th{white-space:normal} #mfam table.oobt.fleet.ord{min-width:900px} #mfam .ndet{display:inline} #mfam .ndet summary{display:inline;cursor:pointer;color:var(--link);font-family:'Gilroy semiBold',Helvetica,sans-serif;letter-spacing:.4px;list-style:none} #mfam .ndet summary::-webkit-details-marker{display:none} #mfam .ndet summary::after{content:' \\203A'} #mfam .ndet[open] summary{display:none} #mfam table.oobt.fleet td:last-child{color:var(--txt2)} #mfam table.oobt.former .tthumb{filter:saturate(.55)} #mfam table.oobt.former tr:hover .tthumb{filter:none} #mfam table.oobt.fleet td:last-child{overflow-wrap:anywhere} #mfam table.oobt.fleet td:last-child{font-size:12.5px;line-height:1.5;color:var(--txt3)} #mfam .de{color:var(--txt3);font-size:12.5px;font-family:'Gilroy regular',Helvetica,Arial,sans-serif;letter-spacing:0;text-transform:none} #mfam .orgcard .de{margin:-3px 0 8px} #mfam .oob dt .de,#mfam table.oobt .de{white-space:nowrap} #mfam .qbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:22px 0 0} #mfam .qin{flex:1 1 280px;max-width:460px;padding:11px 13px;font:400 15px\/1.4 'Gilroy regular',Helvetica,Arial,sans-serif;color:#0d1117;background:#fff;border:1px solid #d3d8e0;border-radius:0;outline:0;-webkit-appearance:none;appearance:none} #mfam .qin:focus{border-color:var(--blue)} #mfam .qin::-webkit-search-cancel-button{display:none} #mfam .qcnt{font-size:12.5px;letter-spacing:.4px;color:var(--txt3);font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .qbtn{padding:10px 13px;font-size:10.5px;letter-spacing:1.1px;text-transform:uppercase;font-family:'Gilroy semiBold',Helvetica,sans-serif;background:#fff;color:var(--txt2);border:1px solid #d3d8e0;border-radius:0;cursor:pointer;line-height:1.4} #mfam .qbtn:hover{border-color:var(--blue);color:var(--blue-ink)} #mfam .qhide{display:none!important} #mfam .qnone{display:none;padding:20px 2px;color:var(--txt2);font-size:15px} #mfam .qnone.on{display:block} #mfam .oob>div{cursor:pointer;user-select:none;align-items:center} #mfam .oob>div:focus-visible{outline:2px solid var(--blue);outline-offset:-2px} #mfam .oob>div>i{position:relative;flex:none;width:13px;height:13px;margin-left:auto;opacity:.75} #mfam .oob>div>i::before,#mfam .oob>div>i::after{content:'';position:absolute;background:#fff;left:0;top:6px;width:13px;height:1.5px} #mfam .oob>div>i::after{transform:rotate(90deg)} #mfam .oob.open>div>i::after{transform:rotate(0)} #mfam .oobwrap.coll .oob>dl{display:none} #mfam .oobwrap.coll .oob.open>dl{display:grid} #mfam table.oobt.cbt td{vertical-align:top} #mfam table.oobt.cbt tr.crow td{border-bottom:0} #mfam table.oobt.cbt tr.cdet>td{border-bottom:1px solid var(--line);padding:0 16px 20px;color:var(--txt2)} #mfam tr.cdet{display:none} #mfam tr.cdet.on{display:table-row} #mfam .cwho{display:block;font-size:12.5px;color:var(--txt3);line-height:1.45;margin-top:3px} #mfam .cserv{display:block;font-size:12.5px;color:var(--txt3);line-height:1.45;margin-top:3px} #mfam .cbx{padding:6px 11px;font-size:10.5px;letter-spacing:1.1px;text-transform:uppercase;font-family:'Gilroy semiBold',Helvetica,sans-serif;background:#fff;color:var(--blue-ink);border:1px solid var(--blue);border-radius:0;cursor:pointer;line-height:1.4;white-space:nowrap} #mfam .cbx:hover{background:var(--blue);color:#fff} #mfam .cdin{display:grid;grid-template-columns:1.6fr 1fr;gap:26px;padding-top:2px;max-width:none} #mfam .cdin p{font-size:16.5px;color:var(--txt2);margin:0 0 11px;max-width:66ch} #mfam .cdin p.crole{color:#0d1117} #mfam .cdl{margin:0} #mfam .cdl dt{font-size:10.5px;letter-spacing:1.6px;text-transform:uppercase;color:var(--txt3);font-family:'Gilroy semiBold',Helvetica,sans-serif;margin-top:12px} #mfam .cdl dt:first-child{margin-top:0} #mfam .cdl dd{margin:3px 0 0;font-size:14.5px;color:#0d1117;line-height:1.55} #mfam .cdl dd a{color:#0d1117;border-bottom:1px solid #c3cddb} #mfam .cdl dd a:hover{color:var(--blue-ink);border-bottom-color:var(--blue)} #mfam .ccav{display:block;font-size:13px;color:var(--txt3);line-height:1.55;margin-top:12px;padding-left:11px;border-left:2px solid var(--line);max-width:64ch} #mfam .clink{display:inline-block;margin:0 14px 0 0;font-size:13.5px} #mfam .cwar{font-size:11px;letter-spacing:1.3px;text-transform:uppercase;color:var(--txt3);font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .statstrip.dark{margin:22px 0 4px} #mfam ul.gl.cml{margin-top:18px!important} #mfam ul.gl.cml li{line-height:1.6} #mfam ul.gl.cml li b{color:#0d1117;font-weight:400;font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .cbig{display:inline-block;margin-top:22px;padding:13px 22px;background:var(--blue);color:#fff!important;border:1px solid var(--blue);border-radius:0;font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:11.5px;letter-spacing:1.6px;text-transform:uppercase;text-decoration:none} #mfam .cbig:hover{background:var(--blue-ink);border-color:var(--blue-ink)} #mfam .badge{height:66px;width:auto;display:block;flex:none;filter:drop-shadow(0 2px 9px rgba(0,0,0,.5))} #mfam .badge.big{height:112px} #mfam .mjc{height:96px;width:auto;display:block;flex:none;filter:drop-shadow(0 2px 9px rgba(0,0,0,.5))} #mfam .mcol{display:flex;flex-direction:column;gap:18px} #mfam .tthumb.none{background:repeating-linear-gradient(45deg,#f3f6fa,#f3f6fa 6px,#e9eef5 6px,#e9eef5 12px)} #mfam .cflag{display:inline-block;width:16px;height:16px;vertical-align:-3px;margin-right:7px;background-repeat:no-repeat;background-size:200px 20px} #mfam .nflag{display:inline-block;width:18px;height:12px;vertical-align:1px;margin-left:8px;background-repeat:no-repeat;background-size:242px 16px} #mfam .st{display:table;font-size:10px;letter-spacing:1.3px;text-transform:uppercase;padding:2px 7px;margin:8px 0 0;font-family:'Gilroy semiBold',Helvetica,sans-serif;border:1px solid currentColor;white-space:nowrap} #mfam .st.on{color:var(--green)} #mfam .st.out{color:var(--amber)} #mfam .st.ord{color:var(--blue-ink)} #mfam .flybtn{display:table;margin:8px 0 0;padding:4px 10px;font-size:10.5px;line-height:1.45;letter-spacing:1.2px;text-transform:uppercase;font-family:'Gilroy semiBold',Helvetica,sans-serif;color:#fff!important;background:var(--blue);border:1px solid var(--blue);white-space:nowrap;max-width:100%} #mfam .flybtn:hover{background:var(--blue-ink);border-color:var(--blue-ink)} #mfam .flybtn.ghost{background:transparent;border:1px solid var(--blue);color:var(--blue-ink)!important;letter-spacing:.9px;white-space:normal;max-width:11em} #mfam table.oobt.former td .flybtn.ghost{color:var(--blue-ink)!important} #mfam .flybtn .via{opacity:.72;letter-spacing:.8px} #mfam table.oobt td a.flybtn{border-bottom:0} #mfam table.oobt.former td a.flybtn{color:#fff!important} #mfam #structure,#mfam #former,#mfam #oob,#mfam #faq{background:var(--bg2)} #mfam .ngrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px} #mfam .ncard{display:block;background:#fff;border:1px solid var(--line);overflow:hidden;text-decoration:none} #mfam .ncard:hover{border-color:var(--blue)} #mfam .ncim{display:block;height:158px;background:#eef1f6 center\/cover no-repeat} #mfam .ncim.none{background:repeating-linear-gradient(45deg,#f3f6fa,#f3f6fa 8px,#e9eef5 8px,#e9eef5 16px)} #mfam .ncbody{display:block;padding:16px 18px 20px} #mfam .ncbody time{display:block;font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:11px;letter-spacing:1.6px;text-transform:uppercase;color:var(--txt3)} #mfam .nct{display:block;font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:17px;line-height:1.32;color:#0d1117;margin:9px 0 8px} #mfam .ncard:hover .nct{color:var(--link)} #mfam .ncx{display:block;font-size:14px;line-height:1.55;color:var(--txt2)} #mfam .ncgo{display:block;font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:12px;letter-spacing:1.4px;text-transform:uppercase;color:var(--link);margin-top:14px} #mfam .nmore{display:inline-block;margin-top:26px;font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:12px;letter-spacing:1.6px;text-transform:uppercase;color:var(--link)} @media(max-width:960px){#mfam .ngrid{grid-template-columns:1fr 1fr}} @media(max-width:620px){#mfam .ngrid{grid-template-columns:1fr}} #mfam #gallery{background:#0d1117} #mfam #gallery h2{color:#fff} #mfam #gallery .spx-lede{color:#9aa3b8} #mfam #gallery .kicker{color:var(--blue)} #mfam #gallery .acard{background:#161b24;border-color:#242c38} #mfam #gallery .acard .tx b{color:#fff} #mfam #gallery .acard .im{background-color:#242c38} #mfam #gallery .acard .im.none{background:repeating-linear-gradient(45deg,#1b212b,#1b212b 8px,#232a35 8px,#232a35 16px)} #mfam .org{margin-top:34px} #mfam .cmdcard{display:flex;align-items:center;gap:26px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--red);padding:22px 26px} #mfam .cface{display:block;flex:none;width:128px;height:128px;background:#eef1f6 center\/cover no-repeat;border:1px solid var(--line)} #mfam .cface.mono{display:flex;align-items:center;justify-content:center;background:var(--blue-dim);color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:44px;letter-spacing:1px;border-color:var(--blue)} #mfam .cmdtx{flex:1 1 auto;min-width:0;text-align:left} #mfam .crank{display:block;font-size:10.5px;letter-spacing:1.8px;text-transform:uppercase;color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .cmdtx b{display:block;font-size:21px;color:#0d1117;margin:3px 0 4px;font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .cmeta{display:block;font-size:13px;color:var(--txt3)} #mfam .cmdorg{flex:none;text-align:left;padding-left:22px;border-left:1px solid var(--line)} #mfam .cmdorg span{display:block;font-size:13.5px;color:#0d1117;font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .cmdorg em{display:block;font-style:normal;font-size:12.5px;color:#8b94a5;margin-top:3px} #mfam .oloc{font-size:12px;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;margin:0 0 9px} #mfam .orgcard,#mfam .orgcard h4,#mfam .orgcard p,#mfam .orgcard .de{text-align:left} #mfam .orgrow{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:16px} #mfam .orgcard{background:#fff;border:1px solid var(--line);border-top:3px solid var(--blue);padding:20px 22px} #mfam .orgcard.wide{grid-column:1\/-1} #mfam .orgcard h4{margin:0 0 7px;font-size:16.5px;color:#0d1117} #mfam .orgcard p{font-size:14px;color:var(--txt2);max-width:none} #mfam .orgcard .tag{display:inline-block;font-size:10px;letter-spacing:1.4px;text-transform:uppercase;color:var(--blue-ink);border:1px solid var(--blue);padding:2px 8px;margin-bottom:11px;font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .orgcard.new{border-top-color:var(--red)} #mfam .orgcard.new .tag{color:var(--red);border-color:var(--red)} #mfam .tfgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:18px} #mfam .tfcol{border-top:1px solid var(--line);padding-top:14px} #mfam .tfcol h4{margin:0 0 3px;font-size:15px;color:#0d1117} #mfam .tfn{font-size:12px;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;margin-bottom:8px} #mfam .tfcol p{font-size:13.5px;color:var(--txt2);margin:0} #mfam .tfmore{display:inline-block;margin-top:12px;font-size:12px;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;border-bottom:1px solid var(--blue)} #mfam .tfmore:hover{color:#0d1117;border-bottom-color:#0d1117} #mfam .ucol{margin-top:12px} #mfam .ucol summary{list-style:none;cursor:pointer;font-size:12px;letter-spacing:1.3px;text-transform:uppercase;color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;padding:7px 0} #mfam .ucol summary::-webkit-details-marker{display:none} #mfam .ucol summary::after{content:' +';font-family:inherit} #mfam .ucol[open] summary::after{content:' \\2013'} #mfam .ucol summary:hover{color:#0d1117} #mfam a.unit{text-decoration:none} #mfam a.unit:hover{border-color:var(--blue);color:var(--blue-ink);background:var(--blue-dim)} #mfam table.oobt tr.flash td{background:var(--blue-dim);transition:background .45s} @media(max-width:900px){#mfam .tfgrid{grid-template-columns:1fr}} #mfam .units{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px} #mfam .unit{font-size:12.5px;padding:5px 11px;background:var(--bg2);border:1px solid var(--line);color:var(--txt2);font-family:'Gilroy semiBold',Helvetica,sans-serif} #mfam .acgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px} #mfam .acard{display:block;background:#fff;border:1px solid var(--line);overflow:hidden} #mfam .acard:hover{border-color:var(--blue)} #mfam .acard .im{display:block;height:132px;background:#eef1f6 center\/cover no-repeat} #mfam .acard .im.none{background:repeating-linear-gradient(45deg,#f3f6fa,#f3f6fa 8px,#e9eef5 8px,#e9eef5 16px)} #mfam .acard .tx{display:block;padding:14px 16px} #mfam .acard .tx b{display:block;font-size:15px;color:#0d1117;line-height:1.3} #mfam .acard .tx em{display:block;font-style:normal;font-size:12px;color:var(--txt3);margin-top:5px;font-variant-numeric:tabular-nums} #mfam .acard:hover .tx b{color:var(--blue-ink)} @media(max-width:1000px){#mfam .acgrid{grid-template-columns:repeat(3,1fr)}#mfam .orgrow{grid-template-columns:1fr 1fr}} @media(max-width:820px){#mfam .tthumb{width:118px;height:79px}#mfam .badge.big{height:84px}#mfam .mjc{height:74px}#mfam .mcol{gap:14px}#mfam .acgrid{grid-template-columns:1fr 1fr}#mfam .orgrow{grid-template-columns:1fr}#mfam .marks{gap:20px}#mfam .photocred{position:static;display:block;padding:0 24px 12px;text-align:left;max-width:none}} @media(max-width:820px){#mfam .cmdcard{flex-wrap:wrap;gap:14px}#mfam .cmdorg{padding-left:0;border-left:0;flex-basis:100%}#mfam .specgrid,#mfam .specgrid.three{grid-template-columns:1fr}#mfam .cols{grid-template-columns:1fr}#mfam .relgrid{grid-template-columns:1fr}#mfam .statstrip{grid-template-columns:1fr 1fr}#mfam .oob dl{grid-template-columns:1fr}#mfam .cdin{grid-template-columns:1fr;gap:18px}#mfam .oob dd{text-align:left}#mfam .frow{grid-template-columns:110px 1fr 56px;gap:10px}#mfam .srclist{columns:1}#mfam .oobmap{height:440px}#mfam .oobmap.home{height:400px}} #mfam .pqband{background:#0d1117;padding:56px 0} #mfam .pqband .wrap{max-width:1120px} #mfam 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.satlbx{position:absolute;top:18px;right:22px;color:rgba(255,255,255,.72);font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:10.5px;letter-spacing:1.6px;text-transform:uppercase} #mfam .satcap{display:flex;justify-content:space-between;align-items:baseline;gap:22px;flex-wrap:wrap;margin-top:12px;font-size:13px;line-height:1.5;color:var(--txt3)} #mfam .satcap b{font-family:'Gilroy semiBold',Gilroy,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;font-weight:400;color:var(--txt)} @media(max-width:820px){#mfam .satimg{height:380px}} @media(max-width:680px){#mfam .qa summary{padding:18px 14px;font-size:17px}#mfam .qa details .a{padding:0 14px 20px}#mfam section{padding:44px 0}} #mfam .mfshare{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:0 0 6px} #mfam .mfsh-btn{display:inline-flex;align-items:center;gap:8px;padding:9px 15px;background:transparent;border:1px solid var(--blue);color:var(--blue-ink);font-family:'Gilroy semiBold',Helvetica,sans-serif;font-size:11.5px;letter-spacing:1.6px;text-transform:uppercase;cursor:pointer;line-height:1} #mfam .mfsh-btn:hover{background:var(--blue);color:#fff} #mfam .mfsh-btn svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.8} #mfam .mfsh-net{display:none;align-items:center;gap:8px;flex-wrap:wrap} #mfam .mfshare.on .mfsh-net{display:flex} #mfam .mfsh-net a,#mfam .mfsh-net button{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border:1px solid var(--line);background:#fff;color:#3d4654;cursor:pointer;padding:0} #mfam .mfsh-net a:hover,#mfam .mfsh-net button:hover{border-color:var(--blue);color:var(--blue-ink)} #mfam .mfsh-net svg{width:16px;height:16px;fill:currentColor} #mfam .mfsh-said{font-size:12px;color:var(--green);font-family:'Gilroy semiBold',Helvetica,sans-serif;letter-spacing:.6px}#mfam .mlogo{display:inline-flex;align-items:center;justify-content:center;background:#fff;padding:10px 16px;height:68px;margin:0 0 18px;border:1px solid #e2e7ee}#mfam .mlogo .li{display:block;background:center\/contain no-repeat}#mfam .mlogo.sm{position:absolute;left:14px;top:96px;height:52px;padding:6px 10px;margin:0}#mfam .mlogo.sm img{max-height:38px;max-width:120px}#mfam .mlogo.xs{height:28px;padding:2px 6px;margin:0 10px 0 0;vertical-align:middle;border:0;background:transparent}#mfam .mlogo.xs img{max-height:24px;max-width:72px}#mfam .mrel{position:relative;padding-top:0}#mfam .mrel .mim{display:block;height:130px;margin:-26px -26px 44px;background:#eef1f6 center\/cover no-repeat}#mfam a.mname{display:inline-flex;align-items:center}#mfam span.acard{cursor:default}#mfam .pcred{font-size:12px;color:var(--txt3);margin:10px 0 28px;line-height:1.5}<\/style>\n<div id=\"mfam\">\n<div class=\"hero photo\">\n<div class=\"heroimg ph1\"><\/div>\n<div class=\"wrap hero-in\">\n<div class=\"crumb\"><a href=\"https:\/\/migflug.com\/air-forces\/\">Order of Battle<\/a> &middot; <a href=\"https:\/\/migflug.com\/aircraft-manufacturers\/\">Aircraft manufacturers<\/a> &middot; United States<\/div>\n<h1>On Mark Engineering<\/h1>\n<div class=\"native\">On Mark Engineering Company<\/div>\n<p class=\"sub\">A Van Nuys rebuild shop turned surplus Second World War Invader bombers into pressurised executive transports, CIA spy-drop aircraft and the B-26K Counter-Invader that hunted trucks on the Ho Chi Minh Trail.<\/p>\n<div class=\"statstrip\">\n<div class=\"stat\"><b>1954<\/b><span>Founded<\/span><\/div>\n<div class=\"stat\"><b>Defunct<\/b><span>Status<\/span><\/div>\n<div class=\"stat\"><b>5<\/b><span>Aircraft on record<\/span><\/div>\n<div class=\"stat\"><b>1<\/b><span>Air forces flying its types<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"photocred\">Photo: USAF \/ Wikimedia Commons (Public domain)<\/div>\n<div class=\"accent\"><\/div>\n<\/div>\n<div class=\"wrap\">\n<div class=\"chips\"><span class=\"chip\"><b>Country<\/b>United States<\/span><span class=\"chip\"><b>Founded<\/b>1954<\/span><span class=\"chip\"><b>Headquarters<\/b>Van Nuys Airport, California<\/span><span class=\"chip\"><b>Status<\/b>Defunct<\/span><\/div>\n<div class=\"mfshare\"><button type=\"button\" class=\"mfsh-btn\"><svg viewBox=\"0 0 24 24\"><circle cx=\"18\" cy=\"5\" r=\"3\"\/><circle cx=\"6\" cy=\"12\" r=\"3\"\/><circle cx=\"18\" cy=\"19\" r=\"3\"\/><path d=\"M8.6 10.6l6.8-4M8.6 13.4l6.8 4\"\/><\/svg>Share<\/button><span class=\"mfsh-net\"><\/span><span class=\"mfsh-said\"><\/span><\/div>\n<\/div>\n<section id=\"story\">\n<div class=\"wrap\">\n<div class=\"kicker\">The story<\/div>\n<h2>On Mark Engineering: the company and the aircraft that made its name<\/h2>\n<div class=\"cols\">\n<div>\n<h3 class=\"sh\">Second lives for the Invader<\/h3>\n<p>In the 1950s America was awash with surplus Douglas A-26 Invaders, fast twin-engined bombers left over from the war. On Mark Engineering, founded in 1954 at Van Nuys Airport in California, saw them as raw material. Its first conversions stripped out military kit, sealed the bomb bays and added windows and soundproofing. Around 1957 it replaced the main spar carry-through with a steel ring spar, freeing the cabin, and sold the result as the On Mark Executive and Marketeer. From 1961 the Marksman added full pressurisation, making the old bomber a fast high-flying business aircraft.<\/p>\n<h3 class=\"sh\">The Blue Goose and the CIA<\/h3>\n<p>Only eight Marksmen were built, and the last two were anything but corporate. Fitted with terrain-following radar and a floor hatch for low-level air drops, they went to companies tied to the CIA. In 1967 one, painted blue and nicknamed <span class=\"imp\">the Blue Goose<\/span>, flew night supply drops for Air America in Laos during the Secret War, until it was judged too fast to drop accurately and too much like a strike aircraft. Both were later evaluated by a clandestine USAF squadron and scrapped.<\/p>\n<h3 class=\"sh\">Counter-Invader and the Pregnant Guppy<\/h3>\n<p>On Mark&rsquo;s biggest military job came in the early 1960s, when the USAF chose it to rebuild the Invader for counter-insurgency. It turned a single B-26 into the YB-26K prototype and then converted 40 B-26K Counter-Invaders with new engines, rebuilt wings and tip tanks; the first production aircraft flew on 30 May 1964. Redesignated A-26A for political reasons, they flew from Thailand against traffic on the Ho Chi Minh Trail, and others went to the Congo. On Mark also did conversion work on the Boeing Stratocruiser that became Aero Spacelines&rsquo; Pregnant Guppy, first flown at Van Nuys in 1962.<\/p>\n<\/div>\n<div>\n<div class=\"pull\">A Van Nuys rebuild shop turned surplus Second World War Invader bombers into pressurised executive transports, CIA spy-drop aircraft and the B-26K Counter-Invader that hunted trucks on the Ho Chi Minh Trail.<cite>On Mark Engineering &middot; verified 2026-10-03<\/cite><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"glance\">\n<div class=\"wrap\">\n<div class=\"kicker\">At a glance<\/div>\n<h2>On Mark Engineering in numbers<\/h2>\n<div class=\"specgrid three\">\n<div class=\"spectable\">\n<h4>The company<\/h4>\n<dl>\n<dt>In short<\/dt>\n<dd>Founded 1954<\/p>\n<ul class=\"gl\">\n<li>Aircraft remanufacturing company at Van Nuys Airport, California<\/li>\n<li>Specialised in Douglas A-26 Invader conversions<\/li>\n<li>Active until the mid-1970s<\/li>\n<\/ul>\n<\/dd>\n<\/dl>\n<\/div>\n<div class=\"spectable\">\n<h4>Production<\/h4>\n<dl>\n<dt>Best known for<\/dt>\n<dd>B-26K Counter-Invader<\/p>\n<ul class=\"gl\">\n<li>40 B-26K Counter-Invaders for the USAF<\/li>\n<li>8 pressurised Marksman executive conversions, 1961&ndash;1964<\/li>\n<li>Executive and Marketeer unpressurised conversions<\/li>\n<li>Conversion work on the Pregnant Guppy prototype<\/li>\n<\/ul>\n<\/dd>\n<\/dl>\n<\/div>\n<div class=\"spectable\">\n<h4>Today<\/h4>\n<dl>\n<dt>Now<\/dt>\n<dd>Defunct<\/p>\n<ul class=\"gl\">\n<li>Marksman and Counter-Invader survivors in museums and storage<\/li>\n<\/ul>\n<\/dd>\n<\/dl>\n<\/div>\n<div class=\"spectable\">\n<h4>The numbers<\/h4>\n<dl>\n<dt>B-26K Counter-Invaders converted<\/dt>\n<dd>40<\/dd>\n<dt>Marksman conversions<\/dt>\n<dd>8<span class=\"gnote\">1961&ndash;1964<\/span><\/dd>\n<\/dl>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"fleet\">\n<div class=\"wrap\">\n<div class=\"kicker\">The aircraft<\/div>\n<h2>Every notable On Mark Engineering aircraft<\/h2>\n<div class=\"tscroll\">\n<table class=\"oobt\" id=\"mfrtbl\">\n<thead>\n<tr>\n<th>Aircraft<\/th>\n<th>Role<\/th>\n<th>First flight<\/th>\n<th>Built<\/th>\n<th>Status<\/th>\n<th>Note<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>On Mark Executive<\/td>\n<td>Executive transport conversion of the A-26<\/td>\n<td><\/td>\n<td><\/td>\n<td><span class=\"pill was\">Retired<\/span><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>On Mark Marketeer<\/td>\n<td>Executive transport conversion of the A-26<\/td>\n<td><\/td>\n<td><\/td>\n<td><span class=\"pill was\">Retired<\/span><\/td>\n<td>Unpressurised; developed from the Executive<\/td>\n<\/tr>\n<tr>\n<td>On Mark Marksman<\/td>\n<td>Pressurised executive transport<\/td>\n<td>1961<\/td>\n<td>8<\/td>\n<td><span class=\"pill was\">Retired<\/span><\/td>\n<td>Two special-purpose aircraft for CIA-linked operators<\/td>\n<\/tr>\n<tr>\n<td>Douglas B-26K Counter-Invader (A-26A)<\/td>\n<td>Counter-insurgency attack aircraft<\/td>\n<td>1964<\/td>\n<td>40<\/td>\n<td><span class=\"pill was\">Retired<\/span><\/td>\n<td>Remanufactured Invaders; used over Laos and in the Congo<\/td>\n<\/tr>\n<tr>\n<td>Aero Spacelines Pregnant Guppy<\/td>\n<td>Outsize cargo transport<\/td>\n<td>1962<\/td>\n<td>1<\/td>\n<td><span class=\"pill was\">Retired<\/span><\/td>\n<td>On Mark carried out conversion work on the Stratocruiser prototype<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"operators\">\n<div class=\"wrap\">\n<div class=\"kicker\">Who flies them<\/div>\n<h2>On Mark Engineering aircraft in the world&rsquo;s air forces<\/h2>\n<p class=\"spx-lede\">1 air forces in the Order of Battle fly or flew On Mark Engineering types. <span class=\"imp\">0 of them still have one in service.<\/span><\/p>\n<div class=\"tscroll\">\n<table class=\"oobt\" id=\"optbl\">\n<thead>\n<tr>\n<th>Air force<\/th>\n<th>In service<\/th>\n<th>Formerly flown<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"was\">\n<td><a href=\"https:\/\/migflug.com\/air-forces\/air-force-of-the-democratic-republic-of-the-congo\/\">Air Force of the Democratic Republic of the Congo<\/a><\/td>\n<td><\/td>\n<td><a href=\"https:\/\/migflug.com\/aircraft\/a-26-invader\/\" class=\"was\">On Mark B-26K Counter-Invader<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"people\">\n<div class=\"wrap\">\n<div class=\"kicker\">Places, people, records<\/div>\n<h2>Where On Mark Engineering built, who led it, what it achieved<\/h2>\n<div class=\"cols\">\n<div>\n<h3>Factories<\/h3>\n<ul class=\"gl\">\n<li><b>Van Nuys works<\/b> &middot; Van Nuys Airport, California<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"timeline\">\n<div class=\"wrap\">\n<div class=\"kicker\">Timeline<\/div>\n<h2>On Mark Engineering, year by year<\/h2>\n<div class=\"tl\">\n<div class=\"tl-item\">\n<div class=\"yr\">1954<\/div>\n<p>On Mark Engineering established at Van Nuys<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1957<\/div>\n<p>Ring-spar modification; Marketeer named<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1961<\/div>\n<p>Pressurised Marksman first flight<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1962<\/div>\n<p>Pregnant Guppy first flight at Van Nuys<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1963<\/div>\n<p>Six civil Marksmen delivered; two special-purpose aircraft follow<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1964<\/div>\n<p>First production B-26K Counter-Invader flies<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1966<\/div>\n<p>B-26K redesignated A-26A and deployed to Thailand<\/p>\n<\/div>\n<div class=\"tl-item\">\n<div class=\"yr\">1967<\/div>\n<p>Marksman &ldquo;Blue Goose&rdquo; flies night supply drops in Laos for Air America<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section id=\"faq\">\n<div class=\"wrap\">\n<div class=\"kicker\">Questions &amp; Answers<\/div>\n<h2>Everything people ask about On Mark Engineering<\/h2>\n<div class=\"qa\">\n<details open>\n<summary>What was On Mark Engineering?<\/summary>\n<div class=\"a\">A California company, founded in 1954 at Van Nuys, that remanufactured surplus Douglas A-26 Invaders for civil and military customers.<\/div>\n<\/details>\n<details>\n<summary>What was the On Mark Marksman?<\/summary>\n<div class=\"a\">A pressurised executive conversion of the A-26 Invader; eight were built from 1961, two for CIA-linked operators.<\/div>\n<\/details>\n<details>\n<summary>What is the B-26K Counter-Invader?<\/summary>\n<div class=\"a\">A counter-insurgency rebuild of the Invader by On Mark; 40 were converted for the USAF and used in Southeast Asia.<\/div>\n<\/details>\n<details>\n<summary>Did On Mark build the Pregnant Guppy?<\/summary>\n<div class=\"a\">It undertook conversion work on the Boeing 377 prototype for Aero Spacelines, which first flew in 1962.<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What was On Mark Engineering?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A California company, founded in 1954 at Van Nuys, that remanufactured surplus Douglas A-26 Invaders for civil and military customers.\"}}, {\"@type\": \"Question\", \"name\": \"What was the On Mark Marksman?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A pressurised executive conversion of the A-26 Invader; eight were built from 1961, two for CIA-linked operators.\"}}, {\"@type\": \"Question\", \"name\": \"What is the B-26K Counter-Invader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A counter-insurgency rebuild of the Invader by On Mark; 40 were converted for the USAF and used in Southeast Asia.\"}}, {\"@type\": \"Question\", \"name\": \"Did On Mark build the Pregnant Guppy?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It undertook conversion work on the Boeing 377 prototype for Aero Spacelines, which first flew in 1962.\"}}]}<\/script><hr class=\"divider\">\n<section>\n<div class=\"wrap\">\n<div class=\"kicker\">Continue the tour<\/div>\n<h2>Around On Mark Engineering<\/h2>\n<div class=\"relgrid\"><a class=\"rel\" href=\"https:\/\/migflug.com\/aircraft-manufacturers\/bell\/\"><span class=\"rk\">United States<\/span><span class=\"rh\">Bell<\/span><span class=\"rp\">The Buffalo firm that built America&rsquo;s first jet fighter and the first aircraft through the sound barrier reinvented itself as the helicopter company &mdash; and&hellip;<\/span><span class=\"go\">Read the Bell page<\/span><\/a><a class=\"rel\" href=\"https:\/\/migflug.com\/aircraft-manufacturers\/cessna\/\"><span class=\"rk\">United States<\/span><span class=\"rh\">Cessna<\/span><span class=\"rp\">A Kansas farm boy&rsquo;s backyard monoplane grew into the company that has built more aeroplanes than anyone &mdash; from the Skyhawk most pilots learn on to the&hellip;<\/span><span class=\"go\">Read the Cessna page<\/span><\/a><a class=\"rel\" href=\"https:\/\/migflug.com\/aircraft-manufacturers\/\"><span class=\"rk\">The index<\/span><span class=\"rh\">All aircraft manufacturers<\/span><span class=\"rp\">Every company that built an aircraft flown by the air forces in the Order of Battle, current and historic.<\/span><span class=\"go\">Open the list<\/span><\/a><\/div>\n<\/div>\n<\/section>\n<hr class=\"divider\">\n<section style=\"padding:48px 0 64px\">\n<div class=\"wrap\">\n<div class=\"kicker\">Sources &amp; Further Reading<\/div>\n<h2>Every fact, checked<\/h2>\n<ul class=\"srclist\">\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/On_Mark_Engineering\" rel=\"nofollow noopener\" target=\"_blank\">On Mark Engineering (Wikipedia)<\/a><span><\/span><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Douglas_A-26_Invader\" rel=\"nofollow noopener\" target=\"_blank\">Douglas A-26 Invader (Wikipedia)<\/a><span><\/span><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/On_Mark_Marksman\" rel=\"nofollow noopener\" target=\"_blank\">On Mark Marksman (Wikipedia)<\/a><span><\/span><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Aero_Spacelines_Pregnant_Guppy\" rel=\"nofollow noopener\" target=\"_blank\">Aero Spacelines Pregnant Guppy (Wikipedia)<\/a><span><\/span><\/li>\n<\/ul>\n<p class=\"verified\">Verified 2026-10-03.<\/p>\n<\/div>\n<\/section>\n<\/div>\n<style>#mfam .ph1{background-image:url(https:\/\/ml5psubhxdln.i.optimole.com\/cb:78--.b845\/w:auto\/h:auto\/q:96\/f:best\/https:\/\/migflug.com\/wp-content\/uploads\/2026\/10\/w16-cd-t-416.jpg)!important}<\/style>\n<style>#mfam 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