wing. The extension behind the flight deck on the Rockwell B-1 Lancer and Boeing 747 was added to improve the cross-sectional area distribution according to the area rule. Aircraft designed according to Whitcomb's area rule (such as the F-102 Delta Dagger and the Northrop F-5) looked odd when they first appeared and were sometimes dubbed "flying Coke bottles", but this became an expected part of the appearance of some transonic aircraft. Visually-apparent indications that the area rule has defined the shape of an aircraft are fuselage "waisting" and tip-tank shaping as on the Northrop F-5, and rear fuselage thinning on business jets with rear engines such as the Bombardier Global Express. The rule also requires careful positioning of parts, like the boosters and cargo bay on rockets and the shape and location of the canopy on the F-22 Raptor. The supersonic area rule was applied, at Mach 2, to the prototype Concorde. The rear fuselage was extended by 3.73m on the production aircraft and reduced wave drag by 1.8%. Images See also Anti-shock body Sonic boom Sound barrier Supersonic aerodynamics Notes Bibliography External links Area rule explained, Aerospace Web. Whitcomb Area Rule and Küchemann Carrots, Aerospace Web. DGLR document German patent search system – look for Patent DE 932410 filed March 21, 1944. 2004: Overuse increases drag but still reduces boom heard on the ground NASA See Image 4 for an extreme example: fuselage before wing, PBS. The Whitcomb Area Rule: NACA Aerodynamics Research and Innovation, History Nasa. , Whitcomb, Richard T, NACA Report 1273, 1956. Contemporary reporting and explanation of area rule, Flight global archives Aerodynamics Aircraft wing design