A co-worker mentioned that he had seen a television program about the X-15, so I thought I’d post a cool pic of the totally awesome rocket plane:
This photo shows one of the four attempts NASA made at launching two X-15 aircraft in one day. This attempt occurred November 4, 1960. None of the four attempts was successful, although one of the two aircraft involved in each attempt usually made a research flight. In this case, Air Force pilot Robert A. Rushworth flew X-15 #1 on its 16th flight to a speed of Mach 1.95 and an altitude of 48,900 feet.
Click for a very-high resolution version.
The nearer of the two B-52 carrier aircraft is NB-52B (52-008) which only retired in 2004 after the flight of the X-43A scramjet.