Former X-33 aerospike engine completes test series
- The test of twin Linear Aerospike XRS-2200 engines, originally built for the X-33 program, was performed Monday, Aug. 6, 2001, at NASA's Stennis Space Center, Miss. While the tests verified the feasability of the new technology, they, along with the X-33
- http://www.spaceflightnow.com/news/n0108/08aerospike/

X-33, X-34 Cancelled by NASA
- NASA announced that the problem-plagued X-33 spaceplane project, a venture that aimed to create a single-stage-to-orbit spaceliner, has been scrapped.
- http://www.space.com/missionlaunches/missions/x33_cancel_010301.html