A request for proposal (RFP) was issued in July 1986, and two contractor teams, Lockheed, Boeing and General Dynamics, along with Northrop and McDonnell Douglas, were selected on 31 October 1986 to undertake a 50-month demonstration phase, culminating in the flight test of two prototypes, the YF-22 and the YF-23.
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On 23 April 1991, the YF-22 was announced by Secretary of the Air Force Donald Rice as the winner of the ATF competition.
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