Grumman X-29

McDonnell Douglas X-36

North American XB-70 ValkyrieNorth American XB-70 ValkyrieNorth American XB-70 ValkyrieGeneral Electric YJ93-GE-3 afterburning turbojet ×6General Electric YJ93-GE-3 afterburning turbojet ×6North American XB-70 ValkyrieNorth American XB-70 Valkyrie

LTV XC-142A

Republic XF-84HRepublic XF-84H

McDonnell XF-85 Goblin

Bell XV-3A

Hawker Siddeley XV-6A (P.1127)

Lockheed YF-12ALockheed YF-12A

Northrop/McDonnell Douglas YF-23Northrop/McDonnell Douglas YF-23Northrop/McDonnell Douglas YF-23General Electric YF120General Electric YF120


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