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The idea for the 747SP came from a joint request between Pan American World Airways and Iran Air who were looking for a high capacity airliner with enough range to cover Pan Am's New York-Middle Eastern routes and Iran Air's planned Tehran-New York route. The Tehran-New York route when launched was the longest nonstop commercial flight in the world. The 747SP is 48 feet 4 inches (14.7 m) shorter than the 747-100. Except for the 747-8, the SP is the only 747 with a fuselage of modified length. Fuselage sections were eliminated fore and aft of the wing, and the centre section of the fuselage was redesigned. Single-slotted flaps replaced the complex triple-slotted Fowler flaps of the 100 series. The under-wing "canoes", which housed the flap mechanisms on full-size 747s, were eliminated entirely on the SP. The 747SP, compared to earlier variants, had a tapering of the aft upper fuselage into the empennage, a double-hinged rudder, and longer vertical and horizontal stabilisers.
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