Following a successful five-minute, 28-second unpowered second free flight of the Shuttle Approach and Landing Tests on Sept. 13, 1977, a formation of six aircraft, including five T-38s and the specially modified NASA 747 that had carried Enterprise aloft for the test, fly overhead to commemorate the event. Enterprise had been perched on top of the 747 Shuttle Carrier Aircraft until explosive bolts separated the two aircraft. NASA Photo ECN-8604
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