Pitcairn PA-5 Mailwing
This plane, built in 1927, was designed to carry mail across the eastern US. It helped build the route structure for what would become Eastern airlines.
Wingspan 33 ft, length 21 ft, height 9 ft, max weight 1612 lb, max speed 136 mph.
Powered by one Wright Whirlwind J-5-C of 200 hp.