Five companies (Bell, Boeing, Fairchild, McDonnell Douglas and the Lockheed/North American Rockwell team) submitted designs at this stage of the competition.

[3] On the Boeing YC-14, the upper-surface-blowing design for high aerodynamic lift used two jet engines that blew high-velocity airstreams over the inboard section of the wing and over special trailing-edge flaps.

To save costs, it used a modified DC-8 nosewheel unit and the DC-10 cockpit, adapted for a two-person crew, with two lower windows for visibility during short-field landings.

[5] The increasing importance of strategic vs. tactical missions eventually led to the end of the AMST program in December 1979.

[7] The C-X program selected a proposal for an enlarged and upgraded YC-15 and one prototype (72-1875) was reclaimed from the Pima Air & Space Museum refurbished and returned to Edwards AFB, CA for flight testing that was later incorporated into development of the C-17 Globemaster III.