YA-10B Night/Adverse Weather two-seat experimental prototype, the sole dual seat A-10. The aircraft was converted from an A-10A. The unique aircraft, once built as YA-10A, made its first flight from Edwards on 4 May 1979. After several tests, the US Congress did not approve funding for the project, so the whole was cancelled. The aircaft is now preserved at Edwards. It is seen here after its period of storage and was prepared for preservation.