North American X-15 #1, Air Force serial 56-6670, on display at the National Air and Space Museum in Washington, DC. As a NASA research pilot, Neil Armstrong flew this aircraft three times between 1960 and 1962.
NASA X-15 @ Washington DC. The X-15 set speed and altitude records in the early 1960s, reaching the edge of outer space and returning with valuable data used in aircraft and spacecraft design. As of 2012, the X-15 holds the official world record for the fastest speed ever reached by a manned rocket-powered aircraft. This is X-15A-1 – 56-6670 the 1st of only 3 built.