From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). From Slides #1550 through 1557. Newspaper title text: “Soviet Announces Atom Test Halt With Condition; U.S. Wants Check; West Requests Pre-Summit Parley”.
Transcribed from back of photo: "Howard Hughes (in cockpit) warms up the XF-11 for its initial test flight. It is one of the world's fastest long-range photographic planes, July 7, 1946."