Space Shuttle gliding and landing; it was originally intended to be outfitted for orbital operations after the test program, but it was found more economical to upgrade the structural test article STA-099 into orbiter "Challenger" (OV-099). An additional test article, dubbed "Pathfinder" (OV-098), was built for form and fit tests, and is on display at the Alabama Space and Rocket Center in Huntsville, AL. "Challenger" disintegrated 73 seconds after launch in 1986, and "Endeavour" was built as a replacement from structural spare components. Building "Endeavour" cost about US$1.7 billion. "Columbia" broke apart over Texas during re-entry in 2003. A Space Shuttle launch
British space programme Peter Longhurst (born in Staines, Middlesex) and RAF Squadron Leader Nigel Wood (born in York) were selected in February 1984 as payload specialists for the Skynet 4 Programme, intended for launch using the Space Shuttle. Boyle resigned from the programme in July 1984 due to Army commitments. Prior to the cancellation of the missions after the Challenger disaster, Wood was due to fly aboard Shuttle mission STS-61-H in 1986 (with Farrimond serving as his back-up) and Longhurst was due to fly aboard Shuttle mission STS-71-C in 1987 (with Holmes serving as back-up). All resigned in 1986, having not flown. Army