A de Havilland DH.4B flown by Captain Lowell H. Smith and Lieutenant John P. Richter receives gasoline from another DH.4B flown by at Rockwell Field, San Diego, California, 27 June 1923. (U.S. Air Force)
Refueling in mid-air by Capt. Lowell H. Smith and Lt. John P. Richter, at Rockwell Field, California, June 1923. They stayed in the air 4 days. DeHaviland airplanes used.