Experimental aircraft Bell X-1A in flight
USAF
1950s <div style="display: none;">date QS:P,+1950-00-00T00:00:00Z/8</div>
<a rel="nofollow" class="external free" href="http://www.af.mil/shared/media/document/AFD-080107-018.pdf">http://www.af.mil/shared/media/document/AFD-080107-018.pdf</a>