Boeing 757 Delta Airlines U.S. Air Force Almost 300 tethered tests hanging

Almost 300 tethered tests hanging from the ceiling of Moffett Field's airship hangar were made in April 1954

the original engines were replaced with Allison V-3420-11 V engines

400 were built

More importantly though

versatile "Herc" has accumulated over 20 million flight hours

Boeing 757 Delta Airlines U.S. Air Force Almost 300 tethered tests hangingDelta Airlines 757 model. The first flight of a Boeing 757 took place in February, 1982. Using the same fuselage cross section as the Boeing 727, but with a length 19 ft. 7 in. greater, the Boeing 757 is a short medium range airliner with a maximum high density seating arrangement for 224 passengers. The Boeing 757 is one of the world's most economical turbofan powered airliners in the short medium range category, showing a fuel saving of 45 per cent