The Boeing 747SP is a shortened, long-range variant of the original 747 designed to fly farther with a smaller passenger load. Its reduced fuselage, modified tail, and lower weight supported ultra-long-range airline and government transport. One 747SP became SOFIA, a joint NASA and German Aerospace Center airborne observatory whose large infrared telescope operated above most of the water vapor in Earth's atmosphere. Boeing's SP drawing gives 56.31 m overall length and 59.64 m span. The listed 317,500 kg MTOW is the 700,000 lb JT9D-7A option; other engine and weight combinations differ. The 331-seat figure is the manual's basic mixed-class arrangement of 28 first-class and 303 economy seats, rather than a government, research, or individual airline cabin.
Future launches and major activity directly linked to this vehicle family.