NASA Photo ID: 81-H-261 Astronauts John Young, left, and Robert Crippen, commander and pilot,
respectively, for the first launch of the Space Shuttle, are pictured with the
modified Grumman Airstream aircraft they used in flying simulated orbiter landings
on April 11, the morning following postponement of a launch of the Shuttle on April
10. The mission "scrub" was due to a malfunction in a backup computer.
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