Captain Lowell Smith and 1st Lt. John Paul Richter refuel their Liberty DH-4B on their way to a record nonstop flight of more than 37 hours in August 1923. (© Museum of Flight/Getty Images)
Captain Lowell Smith and 1st Lt. John Paul Richter refuel their Liberty DH-4B on their way to a record nonstop flight of more than 37 hours in August 1923. (© Museum of Flight/Getty Images)