Boeing 747SP / UnitedBoeing 747SP United Airlines airplane model. The SP suffix in 747SP stands for Special Performance, and points to the ultra long range abilities of these 747 variants that preceded the current 747 400 by 15 years. The 747SP's range is best illustrated by the spate of long range distance records it set in the mid 1970s. The most prominent of those was the delivery flight of a South African Airways SP, which over March 23 24, 1976, flew nonstop with 50

Lockheed was contracted to create a prototype conversion of a C-141A

Originally designed with a single engine

Designated the B-26K

Despite its unique design causing early challenges

the airplane was "preassembled" on the computer

comparable in length to a football field and towering at six stories high

Development of the original Falcon 20 traces back to a joint collaboration between Sud Aviation (which later merged into Aerospatiale) and Dassault in the late 1950s

production rates climbed as high as 1

which included models B to G

Sikorsky S-44 flying boat airplane model

The tailless design reduces the weight

The C-12 Huron