 In the 747SP, the upper deck begins over the section of fuselage that contains the wingbox, not ahead of the wingbox (as is the case with the 747-100 and 747-200).This same design was used in the 747-300 and newer, resulting in a stretched upper deck.Apart from having a significantly shorter fuselage and one fewer cabin door per side, the 747SP differs from other 747 variants in having simplified flaps and a taller vertical tail to counteract the decrease in yaw moment-arm from the shortened fuselage.