Check Six – 1947: First Flight: Boeing XB-47 Stratojet
From the This Day in Aviation website

(U.S. Air Force photo)
17 December 1947: Boeing test pilots Robert M. Robbins and Edward Scott Osler made the first flight of the Model 450, the XB-47 Stratojet prototype. It was a 52-minute flight from Boeing Field, Seattle to Moses Lake, Washington.
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