2 Vintage United Airlines Postcards/Interior Plane/Cargo-Mail Here are two vintage postcards from United Airlines. Delicious full-course meals, prepared in the nation's largest network of airline kitchens are served by a United stewardess with the compliments of United Airlines (not anymore). Mail and express is put aboard Uniteds' 4-engines 300 mile-an-hour Mainliner. In the "Age of Flight" these planes will streak across the country carrying 52 passengers and 5500 pounds of cargo. Unused and very minor corner and edge wear. Perfect for the airline or plane collector. s/h is$1.00 in USA.