{"id":298016,"date":"2026-04-10T19:21:18","date_gmt":"2026-04-10T17:21:18","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/"},"modified":"2026-04-10T19:22:31","modified_gmt":"2026-04-10T17:22:31","slug":"mach-6-7-at-the-edge-of-space-the-x-15-story","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/","title":{"rendered":"Mach 6.7 at the Edge of Space: The X-15 Story"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\nOn October 3, 1967, test pilot William J. \u201cPete\u201d Knight climbed into a black, dart-shaped aircraft bolted to the wing of a B-52 bomber. At 45,000 feet over the Mojave Desert, the B-52 released him. Knight lit the rocket engine. In the next 84 seconds, he accelerated through Mach 1, Mach 2, Mach 3, Mach 4, Mach 5, Mach 6, and kept going. He hit Mach 6.7 \u2014 4,520 miles per hour \u2014 at an altitude of 102,100 feet.\n\nThat speed record for a piloted, powered aircraft still stands today. Nearly sixty years later, no human being has flown faster in an airplane.\n\nThe North American X-15 was not a fighter. It was not a bomber. It was a research vehicle \u2014 a flying laboratory designed to answer questions that no wind tunnel or computer simulation of the era could resolve. What happens to an airframe at hypersonic speeds? How does a pilot control an aircraft at the edge of space? What are the thermal, structural, and physiological limits of manned flight?\n\nThe answers the X-15 programme produced shaped everything that came after: the Space Shuttle, the SR-71, the scramjet programmes, and the very concept of reusable spaceflight.\n\n\n<div style=\"background:#f0f4f8;border-left:4px solid #5C91FF;padding:18px 22px;margin:24px 0;border-radius:0 8px 8px 0\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#333;font-size:18px\">Quick Facts<\/p>\n<ul style=\"margin:0;padding-left:20px;color:#444;line-height:1.8\">\n<li><strong>Aircraft:<\/strong> North American X-15<\/li>\n<li><strong>Manufacturer:<\/strong> North American Aviation<\/li>\n<li><strong>First flight:<\/strong> June 8, 1959<\/li>\n<li><strong>Last flight:<\/strong> October 24, 1968<\/li>\n<li><strong>Total flights:<\/strong> 199<\/li>\n<li><strong>Speed record:<\/strong> Mach 6.7 \/ 4,520 mph (Pete Knight, Oct. 3, 1967)<\/li>\n<li><strong>Altitude record:<\/strong> 354,200 ft \/ 107,960 m (Joe Walker, Aug. 22, 1963)<\/li>\n<li><strong>Engine:<\/strong> Reaction Motors XLR99 (57,000 lbf thrust)<\/li>\n<li><strong>Pilots who earned astronaut wings:<\/strong> 8 (by reaching 50+ miles altitude)<\/li>\n<li><strong>Aircraft built:<\/strong> 3<\/li>\n<li><strong>Fatalities:<\/strong> 1 (Michael Adams, Nov. 15, 1967)<\/li>\n<\/ul>\n<\/div>\n\n\n<h2 style=\"padding-top:22px\">Born from a B-52\u2019s Wing<\/h2>\n\nThe X-15 could not take off under its own power. It was too small to carry enough fuel for a ground takeoff, too fast to use a conventional runway, and too specialised to waste any of its precious propellant on the mundane act of getting airborne. Instead, it was carried aloft by a modified B-52 Stratofortress \u2014 nicknamed \u201cBalls 8\u201d \u2014 slung beneath the bomber\u2019s right wing like a black dagger.\n\nAt approximately 45,000 feet, the X-15 dropped free. The pilot had a few seconds of unpowered glide before igniting the Reaction Motors XLR99 rocket engine, which produced 57,000 pounds of thrust by burning anhydrous ammonia and liquid oxygen. The burn lasted roughly 80 to 120 seconds. In that brief window, the X-15 accelerated to speeds and altitudes that no other piloted aircraft could reach.\n\nOnce the fuel was gone, the X-15 became a glider \u2014 a very fast, very heavy, very unforgiving glider that needed to bleed off energy and land on the dry lakebeds of Rogers Dry Lake at Edwards Air Force Base. There were no go-arounds. There was no second chance. The pilot had to get it right the first time, every time.\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=184110924  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/e5\/X-15_in_flight.jpg\/960px-X-15_in_flight.jpg\" alt=\"X-15 in powered flight\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The X-15 during powered flight over the Mojave Desert. The aircraft\u2019s black colour came from its Inconel X heat-resistant nickel alloy skin. NASA<\/figcaption><\/figure>\n\n\n<h2 style=\"padding-top:22px\">Where Air Ends and Space Begins<\/h2>\n\nThe X-15 did not just fly fast. It flew high \u2014 so high that conventional aerodynamic controls stopped working. At extreme altitudes, the air is too thin for ailerons, elevators, and rudders to bite. The X-15 solved this with small hydrogen peroxide reaction control thrusters in the nose and wingtips \u2014 the same type of attitude control system that would later be used on the Space Shuttle and Apollo spacecraft.\n\nOn August 22, 1963, NASA test pilot Joseph Walker reached 354,200 feet \u2014 67 miles above the earth. He was above 99.99 per cent of the atmosphere. He was, by any reasonable definition, in space. The curvature of the earth was visible through his canopy. The sky was black.\n\nEight X-15 pilots earned astronaut wings by exceeding 50 miles altitude, the U.S. Air Force\u2019s definition of the boundary of space. Some of them would later fly in the Gemini and Apollo programmes. The X-15 was their first taste of what lay beyond the atmosphere.\n\n<h2 style=\"padding-top:22px\">The Heat Problem<\/h2>\n\nAt Mach 6, the leading edges of an aircraft reach temperatures that would melt aluminium. The X-15\u2019s skin was made from Inconel X, a nickel-chromium alloy that could withstand temperatures exceeding 1,200 degrees Fahrenheit. The aircraft was painted black not for aesthetics but because dark surfaces radiate heat more efficiently.\n\nEven with Inconel X, the thermal challenge was brutal. The windshield was made of fused silica glass with a retractable outer pane. The landing gear had to be kept retracted until the final approach because the speed would have ripped conventional gear doors off the airframe. Internal components required careful thermal management to prevent instruments, electronics, and even the pilot\u2019s pressure suit from overheating.\n\n\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px\"><img data-opt-id=1166237617  fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/f0\/X-15_on_lakebed.jpg\/960px-X-15_on_lakebed.jpg\" alt=\"X-15 on the dry lakebed at Edwards AFB\" style=\"max-width:100%;height:auto;border-radius:6px\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">An X-15 rests on the dry lakebed at Edwards Air Force Base after landing. The aircraft used skid landing gear and required the vast, flat desert surface for touchdown. NASA<\/figcaption><\/figure>\n\n\nThe thermal data the X-15 collected was priceless. Engineers learned how heat distributes across a hypersonic airframe, where the hottest spots form, and how different materials and coatings respond. This knowledge flowed directly into the design of the SR-71 Blackbird\u2019s titanium structure and the Space Shuttle\u2019s thermal protection tiles.\n\n<h2 style=\"padding-top:22px\">The Pilots<\/h2>\n\nTwelve men flew the X-15. They included some of the most accomplished test pilots in history: Neil Armstrong, who would walk on the moon three years after his last X-15 flight. Scott Crossfield, who made the first powered X-15 flight. Joe Walker, who set the altitude record. Pete Knight, who set the speed record. And Michael Adams, who died on November 15, 1967, when his X-15 entered a hypersonic spin during re-entry and broke apart.\n\nAdams\u2019s death was the programme\u2019s only fatality in 199 flights \u2014 a safety record that is remarkable given the extreme conditions. The X-15 operated routinely at the absolute edge of what was physically possible, in an era before fly-by-wire, before digital flight computers, before any of the safety systems that modern test pilots take for granted. The margins were razor-thin. The pilots knew it.\n\n<h2 style=\"padding-top:22px\">A Record That Still Stands<\/h2>\n\nPete Knight\u2019s Mach 6.7 speed record from October 1967 remains unbroken by any piloted, powered, winged aircraft. The SR-71 Blackbird\u2019s official top speed of Mach 3.3 is less than half of what the X-15 achieved. No modern fighter, no experimental aircraft, no hypersonic demonstrator with a human pilot has gone faster.\n\nThe record has survived because the X-15 occupied a unique niche: fast enough to be a spacecraft, low enough to be an airplane, and crewed by pilots who were willing to ride a rocket into the unknown with nothing but their skill and a pressure suit between them and the void.\n\nThe three X-15 airframes are now museum pieces. One hangs in the Smithsonian\u2019s National Air and Space Museum in Washington. Another sits at the Air Force Flight Test Museum at Edwards. The third was destroyed in Mike Adams\u2019s fatal flight.\n\nBut the data they collected flies on \u2014 in every spacecraft, every hypersonic vehicle, every piece of thermal protection designed to keep humans alive at impossible speeds. The X-15 did not just set records. It wrote the textbook that made the next fifty years of aerospace possible.\n\n<p><em>Sources: NASA, Smithsonian National Air and Space Museum, Air Force Flight Test Museum<\/em><\/p>\n\n\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px;border-radius:0 8px 8px 0\">\n<p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p>\n<p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/the-sr-71s-last-flight-a-speed-record-on-the-way-to-the-museum\/\">The SR-71\u2019s Last Flight: A Speed Record on the Way to the Museum<\/a><\/p>\n<p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/jetflights\/how-stealth-really-works-and-why-invisible-is-a-lie\/\">How Stealth Really Works \u2014 And Why \u2018Invisible\u2019 Is a Lie<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>On October 3, 1967, test pilot William J. \u201cPete\u201d Knight climbed into a black, dart-shaped aircraft bolted to the wing of a B-52 bomber. At 45,000 feet over the Mojave Desert, the B-52 released him. Knight lit the rocket engine. In the next 84 seconds, he accelerated through Mach 1, Mach 2, Mach 3, Mach [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":298088,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[666,664],"tags":[],"class_list":["post-298016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog\" \/>\n<meta property=\"og:description\" content=\"On October 3, 1967, test pilot William J. \u201cPete\u201d Knight climbed into a black, dart-shaped aircraft bolted to the wing of a B-52 bomber. At 45,000 feet over the Mojave Desert, the B-52 released him. Knight lit the rocket engine. In the next 84 seconds, he accelerated through Mach 1, Mach 2, Mach 3, Mach [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/\" \/>\n<meta property=\"og:site_name\" content=\"MiGFlug.com Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-10T17:21:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-10T17:22:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/e5\/X-15_in_flight.jpg\/960px-X-15_in_flight.jpg\" \/>\n<meta name=\"author\" content=\"MiGFlug Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"MiGFlug Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/\"},\"author\":{\"name\":\"MiGFlug Team\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#\\\/schema\\\/person\\\/c85b77ae2dc8afe1ef19cf61db6ba809\"},\"headline\":\"Mach 6.7 at the Edge of Space: The X-15 Story\",\"datePublished\":\"2026-04-10T17:21:18+00:00\",\"dateModified\":\"2026-04-10T17:22:31+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/\"},\"wordCount\":1196,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/04\\/x15-mach6-featured.jpg\",\"articleSection\":[\"History &amp; Legends\",\"Military Aviation\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/\",\"url\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/\",\"name\":\"Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/04\\/x15-mach6-featured.jpg\",\"datePublished\":\"2026-04-10T17:21:18+00:00\",\"dateModified\":\"2026-04-10T17:22:31+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#\\\/schema\\\/person\\\/c85b77ae2dc8afe1ef19cf61db6ba809\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#primaryimage\",\"url\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/04\\/x15-mach6-featured.jpg\",\"contentUrl\":\"https:\\/\\/migflug.com\\/jetflights\\/wp-content\\/uploads\\/sites\\/4\\/2026\\/04\\/x15-mach6-featured.jpg\",\"width\":960,\"height\":721},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/mach-6-7-at-the-edge-of-space-the-x-15-story\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mach 6.7 at the Edge of Space: The X-15 Story\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#website\",\"url\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/\",\"name\":\"MiGFlug.com Blog\",\"description\":\"for those interested in flying military jets and aviation related  topics\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/#\\\/schema\\\/person\\\/c85b77ae2dc8afe1ef19cf61db6ba809\",\"name\":\"MiGFlug Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g\",\"caption\":\"MiGFlug Team\"},\"url\":\"https:\\\/\\\/migflug.com\\\/jetflights\\\/author\\\/mike4mig\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/","og_locale":"en_US","og_type":"article","og_title":"Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog","og_description":"On October 3, 1967, test pilot William J. \u201cPete\u201d Knight climbed into a black, dart-shaped aircraft bolted to the wing of a B-52 bomber. At 45,000 feet over the Mojave Desert, the B-52 released him. Knight lit the rocket engine. In the next 84 seconds, he accelerated through Mach 1, Mach 2, Mach 3, Mach [&hellip;]","og_url":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/","og_site_name":"MiGFlug.com Blog","article_published_time":"2026-04-10T17:21:18+00:00","article_modified_time":"2026-04-10T17:22:31+00:00","og_image":[{"url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/e\/e5\/X-15_in_flight.jpg\/960px-X-15_in_flight.jpg","type":"","width":"","height":""}],"author":"MiGFlug Team","twitter_card":"summary_large_image","twitter_misc":{"Written by":"MiGFlug Team","Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#article","isPartOf":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/"},"author":{"name":"MiGFlug Team","@id":"https:\/\/migflug.com\/jetflights\/#\/schema\/person\/c85b77ae2dc8afe1ef19cf61db6ba809"},"headline":"Mach 6.7 at the Edge of Space: The X-15 Story","datePublished":"2026-04-10T17:21:18+00:00","dateModified":"2026-04-10T17:22:31+00:00","mainEntityOfPage":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/"},"wordCount":1196,"commentCount":0,"image":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#primaryimage"},"thumbnailUrl":"https:\/\/ml5psubhxdln.i.optimole.com\/cb:_Gpg.ba82\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/04\/x15-mach6-featured.jpg","articleSection":["History &amp; Legends","Military Aviation"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/","url":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/","name":"Mach 6.7 at the Edge of Space: The X-15 Story | MiGFlug.com Blog","isPartOf":{"@id":"https:\/\/migflug.com\/jetflights\/#website"},"primaryImageOfPage":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#primaryimage"},"image":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#primaryimage"},"thumbnailUrl":"https:\/\/ml5psubhxdln.i.optimole.com\/cb:_Gpg.ba82\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/04\/x15-mach6-featured.jpg","datePublished":"2026-04-10T17:21:18+00:00","dateModified":"2026-04-10T17:22:31+00:00","author":{"@id":"https:\/\/migflug.com\/jetflights\/#\/schema\/person\/c85b77ae2dc8afe1ef19cf61db6ba809"},"breadcrumb":{"@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#primaryimage","url":"https:\/\/ml5psubhxdln.i.optimole.com\/cb:_Gpg.ba82\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/04\/x15-mach6-featured.jpg","contentUrl":"https:\/\/ml5psubhxdln.i.optimole.com\/cb:_Gpg.ba82\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/jetflights\/wp-content\/uploads\/sites\/4\/2026\/04\/x15-mach6-featured.jpg","width":960,"height":721},{"@type":"BreadcrumbList","@id":"https:\/\/migflug.com\/jetflights\/mach-6-7-at-the-edge-of-space-the-x-15-story\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Startseite","item":"https:\/\/migflug.com\/jetflights\/"},{"@type":"ListItem","position":2,"name":"Mach 6.7 at the Edge of Space: The X-15 Story"}]},{"@type":"WebSite","@id":"https:\/\/migflug.com\/jetflights\/#website","url":"https:\/\/migflug.com\/jetflights\/","name":"MiGFlug.com Blog","description":"for those interested in flying military jets and aviation related  topics","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/migflug.com\/jetflights\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/migflug.com\/jetflights\/#\/schema\/person\/c85b77ae2dc8afe1ef19cf61db6ba809","name":"MiGFlug Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/4a837c13dd5befdb3bffd441395bd29144e82ec9cb4d40a2d01d07d6a1d169b2?s=96&d=mm&r=g","caption":"MiGFlug Team"},"url":"https:\/\/migflug.com\/jetflights\/author\/mike4mig\/"}]}},"_links":{"self":[{"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/posts\/298016","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/comments?post=298016"}],"version-history":[{"count":1,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/posts\/298016\/revisions"}],"predecessor-version":[{"id":298022,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/posts\/298016\/revisions\/298022"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/media\/298088"}],"wp:attachment":[{"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/media?parent=298016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/categories?post=298016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/migflug.com\/jetflights\/wp-json\/wp\/v2\/tags?post=298016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}