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Trotz des formellen Aus für die Produktion der B-1A gingen Testflüge der Prototypen ebenso wie der bereits begonnene Bau der vierten Maschine im Rahmen eines Forschungs- und Entwicklungsprogramms weiter. Das vierte Modell (76-0174) hob schließlich am 14. Februar 1979 erstmals ab. Bereits im Oktober des vorangegangenen Jahres hatte der zweite Prototyp mit Mach 2,2 einen neuen Geschwindigkeitsrekord für die B-1 aufgestellt. Als das Forschungsprogramm im April 1981 endete, hatten die vier Flugzeuge insgesamt fast 1900 Flugstunden in 350 Flügen absolviert.

The Rockwell B-1 Lancer [N 1] is a supersonic variable-sweep wing , heavy bomber used by the United States Air Force (USAF). It is commonly called the "Bone" (from "B-One"). It is one of three strategic bombers in the USAF fleet as of 2017 [update] , the other two being the B-2 Spirit "Stealth Bomber", and the B-52 Stratofortress .

The B-1B Lancer was developed by Rockwell International, now Boeing Defense And Space Group, and is the US Air Force long-range strategic bomber. The B-1B has the largest internal payload of any current bomber. The B-1B became operational in 1986. In July 2001, the US Department of Defense announced plans to cut its B-1B inventory from 92 to 67 as a cost-saving measure. The first aircraft was withdrawn from service in August 2002. Following Operation Iraqi Freedom, it was decided that there should be 67 aircraft in the fleet.