The Martin Marietta X-24A was an experimental US aircraft developed from a joint USAF-NASA program named PILOT (1963–1975). It was designed and built to test lifting body concepts experimenting with the concept of unpowered reentry and landing later used by the Space Shuttle.
Made by Martin Marietta.
It is the successor of the Martin X-23 PRIME ,
Martin Marietta X-24A is the predecessor of the Martin Marietta X-24B.