The B-1A program was cancelled by President Jimmy Carter and ended flight testing in April 1981. Re-instated by Ronald Regan, the four B-1A aircraft had some systems modified for testing the redesigned B-1B. This is the second aircraft pictured between test flights. It crashed during testing on Aug 29, 1984 when the bomber lost control during a configuration change (center of gravity was well aft of the limit due to fuel transfer error).