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Boeing RC-1 – cargo aircraft, canceled; Boeing Sonic Cruiser – near-sonic airliner, canceled; Boeing Liquid Hydrogen (LH 2) airplane that uses liquid hydrogen as fuel [28] Hypersonic Airliner Concept. Mach 5 speed [29] [30] Boeing 747-500 – larger ultra-haul version of the Boeing 747; Boeing X-66 – experimental Transonic Truss-Braced ...
The Boeing 747 is a long-range wide-body airliner designed and manufactured by Boeing Commercial Airplanes in the United States between 1968 and 2023. After the introduction of the 707 in October 1958, Pan Am wanted a jet 2 + 1 ⁄ 2 times its size, to reduce its seat cost by 30%.
The Boeing 747 was retired by most of the world's airlines in 2020, but not all of them went to the scrapyard.
The Boeing RC-135 is a family of large reconnaissance aircraft built by Boeing and modified by a number of companies, including General Dynamics, Lockheed, LTV, E-Systems, L3Harris Technologies, and used by the United States Air Force and Royal Air Force to support theater and national level intelligence consumers with near real-time on-scene collection, analysis and dissemination capabilities.
The gas-guzzling four-engine 747 is costly and inefficient compared to newer twin-engine widebodies, like Boeing's 777 and 787 and Airbus' A330neo and A350, that airlines now more readily rely on.
Pratt & Whitney faced difficulties with the JT9D design during the Boeing 747 test program. Engine failures during the flight test program resulted in thirty aircraft being parked outside the factory with concrete blocks hanging from the pylons, awaiting redesigned engines. Boeing and Pratt & Whitney worked together in 1969 to solve the problem.