the rockwell x-30 was an advanced technology demonstrator project for the national aero-space plane (nasp), part of a united states project to create a single-stage-to-orbit (ssto) spacecraft and passenger spaceliner. it was cancelled in the early 1990s before a prototype was completed, although much development work in advanced materials and aerospace design was completed. while a goal of a future nasp was a passenger liner capable of two-hour flights from washington to tokyo, the x-30 was planned for a crew of two and oriented towards testing.