April 19, 1946 – First flight (Glide) of the Bell X-1, originally designated XS-1, joint NACA-U. S. Army/USAF supersonic research project, first of the so-called X-planes. And so it begins...#BellX1 @usairforce @USArmy @VogueParis
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@DARPA must agree - it is now the Experimental Spaceplane program, formerly known as XS-1. https://www.darpa.mil/program/experimental-space-plane …
Because there is only one XS-1 of which someone reminded them :-) @usairforce @TIME
