After 2.5 years of meticulous maintenance and restoration, the Commemorative Air Force’s B-24 Liberator “Diamond Lil” is ready to fly again. On April 11, 2026, at the Henry B. Tippie National Aviation Education Center in Dallas, Texas, the world’s only regularly flying Consolidated B-24 Liberator will return to the skies. It’s the kind of moment that warbird enthusiasts mark on their calendars in red—a genuine piece of American aviation history, still airworthy, still magnificent, still capable of touching the sky.

Diamond Lil is not just any B-24. With serial number AM927, this aircraft was built in 1940 and is among the oldest surviving Liberators in existence. It has been flying with the Commemorative Air Force since 1968, participating in countless air shows, warbird demonstrations, and education missions. The aircraft carries the accumulated legacy of 18,482 B-24s built during World War II—more than any other American warplane of the era. That staggering production number reflects the central role the Liberator played in defeating Nazi Germany and Imperial Japan.

But numbers don’t capture what it’s like to stand beneath a B-24, to watch it taxi across a runway, to hear its engines throttle up and feel the ground shake beneath your feet. Diamond Lil is that connection made tangible—a four-engine reminder that Americans built thousands of heavy bombers, that ordinary pilots flew them into extraordinary danger, and that some of those machines have survived to tell their stories.

The Liberator: Workhorse of the Long War

The B-24 Liberator was not the most famous American heavy bomber of World War II. That distinction belonged to the B-17 Flying Fortress, which captured the public imagination with its sleek lines and legendary toughness. But in sheer numbers and operational reach, the B-24 dominated. It could fly higher than the B-17. It could carry a heavier bomb load. It had a longer range, which meant it could reach targets that B-17s could not. For the strategic bombing campaign against Nazi Germany and the long-range interdiction missions across the Pacific, the B-24 was indispensable.

Yet the B-24 never enjoyed the affection lavished on the B-17. Crews called it “The Flying Coffin” and “The Crate.” It was harder to fly, less forgiving of pilot error, more prone to catching fire. The belly turret was cramped and uncomfortable. The fuselage was fragile compared to the B-17’s more robust structure. It required constant maintenance and careful handling. And yet, thousands of crews flew it into combat, and thousands of them came home. The B-24 was a machine that demanded respect and rewarded competence.

The aircraft that became Diamond Lil arrived at American airfields in 1940, part of the first wave of Liberators delivered before the United States even entered the war. Initially designated “Ol’ 927,” the aircraft would fly countless missions across multiple theaters, carrying the strain of combat and the weight of war. When it finally retired from military service, its story should have ended. Instead, the Commemorative Air Force rescued it, and since 1968, Diamond Lil has been resurrecting the spirit of that era for audiences who never experienced it firsthand.

The Two-and-a-Half-Year Restoration

Keeping a seventy-five-year-old four-engine bomber in flying condition is not a weekend project. Every component has a service life. Engines need overhaul. Hydraulic systems need flushing and repressurization. Fabric-covered control surfaces need inspection and repair. Wiring harnesses need replacement. Fuel system components need testing and certification. The work is meticulous, exacting, and requires expertise that is increasingly rare in the world.

The Commemorative Air Force maintains a small team of volunteer mechanics and engineers who understand these machines—men and women who have spent careers working on vintage aircraft. Over 2.5 years, they disassembled, inspected, repaired, tested, and reassembled Diamond Lil with the kind of care that borrows from both engineering discipline and love. The result is an aircraft that is not restored to museum condition, but restored to flying condition—ready to climb to altitude, ready to maneuver, ready to feel the wind beneath its wings again.

This is an achievement worth celebrating. There are only a handful of flying B-24s left in the world, and Diamond Lil is the only one that flies regularly in America. When it takes to the air on April 11, it carries with it the entire history of the 18,482 B-24s that were built. Every rivet is a remembrance. Every engine start is a victory against time.

Warbird Weekend in Dallas

The Warbird Weekend at the Henry B. Tippie National Aviation Education Center will be a gathering of rare and irreplaceable aircraft. Diamond Lil will be there, flying and visible. So will FIFI—the only flying B-29 Superfortress in the entire world. FIFI is the crown jewel of American warbird aviation, a 35-ton giant with four 2,200-horsepower engines and a combat history that stretches from the closing months of the Pacific War to decades of cold war service. Seeing a B-29 in the air is like watching a living dinosaur.

The event will also feature other vintage aircraft: the A-26 Invader, a fast attack bomber that saw service from World War II through Korea; the R4D Ready 4 Duty, a Douglas transport variant; and the C-45 Bucket of Bolts, a utility transport that served in countless squadrons. But the star will be Diamond Lil—the regular flyer, the engine of education, the reminder that history isn’t confined to museums.

Visitors will have the chance to experience these aircraft firsthand. For those adventurous enough and deep-pocketed enough, flight experiences are available in both the B-24 and the B-29. Imagine strapping into a 1940s heavy bomber, feeling four massive engines roar to life, watching the ground drop away beneath you as you climb through 10,000 feet. It’s the kind of experience that changes people. It makes history real in a way that no photograph or documentary can match.

The Value of Flying History

Museums preserve aircraft. But flying them does something different—it honors them. When Diamond Lil takes to the air, it’s not a display. It’s a statement. It says: these machines were not made to sit still. They were made to fly. They were made to carry brave people into danger. They were made to accomplish impossible missions. To see one in the sky is to understand, in a visceral way, what it meant to be a bombardier or a gunner or a navigator in a heavy bomber over Germany or Japan.

The Commemorative Air Force understands this. That’s why they spend millions restoring and maintaining these aircraft, why they fly them constantly, why they open them to the public and allow people to touch them, sit in them, and when possible, fly in them. It’s education through experience. It’s history that moves and speaks and roars.

Diamond Lil’s return to the sky is a cause for genuine celebration. It’s a victory for the volunteers who worked on it, for the organization that preserved it, and for everyone who believes that the machines and the people of the greatest generation deserve to be remembered—not just as names in a history book, but as living, breathing, flying reminders of what courage and determination can accomplish. When that B-24 lifts off the runway on April 11, it carries with it the gratitude of a nation that still remembers.

Sources: Commemorative Air Force historical records and restoration documentation; B-24 Liberator production history and deployment records; Warbird Weekend event information and participant aircraft details; U.S. Army Air Forces historical archives on the B-24’s operational role in World War II.