A closer look at why the Lockheed U-2's max altitude remains classified, and the unclassified 70,000-foot service ceiling is ...

The USAF is already looking to replace its most advanced fighter jets and bombers, even as it upgrades its B-52s and orders ...

The Lockheed U-2 is one of the most groundbreaking aircraft ever devised. In the mid-1950s, when commercial aircraft were flying at 35,000 feet and jet fighters could maybe push 60,000 feet, the U-2 ...

Spy aircraft typically have the highest operational ceiling, although these values, and often the aircraft themselves, are ...