"MPTA-098" was a designator for a set of External tank and Solid Rocket Boosters, for testing. Pathfinder, an "orbiter simulator" that never had a designation, and was never designed to enter orbit, is on permanent display at the Alabama Space and Rocket Center in Huntsville Alabama. It is on a specal platform and mounted to the Main Propulsion Test Article (MPTA) External Tank used for early tanking tests.

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