Monomail mail plane
Credit - Boeing Corporation
Douglas DC-2
Boeing 247 flying the mail
Credit - United Airlines Archives
Army mail routes
Credit - ") 2001 National Air and Space Museum, Smithsonian Institution (SI Neg. No WF-30747)"
Walter Folger Brown being sworn in
Credit - Heppenheimer/AP/World Wide Photo
Stinson plane for skyhooking mail
Credit - ") 2001 National Air and Space Museum, Smithsonian Institution (SI Neg. No 74-3445)"