 Bell, Boeing-Vertol (teamed with Grumman), Hughes, Lockheed, and Sikorsky all submitted proposals for the AAH program.In June 1973, Bell and Hughes were selected as finalists, and each was awarded a contract for the construction of two prototype aircraft.The Bell entry, the Model 409 (YAH-63), was by no means "just another Cobra design" though it utilized Cobra technology where possible.