The North American XB-70 Valkyrie, a Cold War-era bomber, was a technological marvel designed to fly at Mach 3 and at 70,000 feet, circumventing Soviet air defenses through speed and altitude.

The B-52 was nearly cancelled before a sliver of metal was cut. By the fall of 1948, Boeing had designed a swept-wing, tur- boprop-powered XB-52, but in October a Boeing team at Wright Field in ...

The massive B-52 was the U.S.’s long-range strategic bomber in the 1950s, ... the early design documents for the plane that would eventually become the XB-70 called for a plane using nuclear power.

Around this time, the XB-52 design was almost nixed altogether. The service believed that by the time the platform would be mission-ready, it would be obsolete and offer only minimal improvements ...

The North American XB-70 was supposed to be a game-changing Mach 3 bomber, ... the B-52 it was meant to replace has continued in the bomber role ever since and will do so for many more years to come.

Boom Supersonic's XB-1 demonstrator jet became the first U.S.-made civilian supersonic jet to break the sound barrier. The independently funded XB-1 reached a speed of Mach 1.122, or about 750 mph ...

Boom Supersonic's XB-1 jet broke the sound barrier for the first time on Monday as the American company seeks to deliver the world's faster airliner capable of carrying passengers between New York ...

U.S. lawmakers introduced Wednesday the Supersonic Aviation Modernization Act in a bid to revise the FAA's 52-year ban on supersonic flight over U.S.

What You Need to Know: The North American XB-70 Valkyrie was an ambitious supersonic bomber designed to replace the B-52, capable of flying at Mach 3 and 70,000 feet.With six powerful engines and ...