Douglas DC-3
A DC-3 flies over Denver's old Stapleton airport, as it appeared in the era of the DC-3. Note the luxury of curtains on this definitely-not-military aircraft.
The DC-3 was famous as both a civilian and a military transport. With the DC-3's innovations of a galley and sleeping berths, passengers could fly across the continent in one (long) day instead of days of flight by day and train by night. Charles Lindbergh insisted that it be designed to be able to fly on only one engine, and one flew that way from Hawaii to California. Another received 3000 bullet holes, but returned to flight after a canvas-and-glue repair. No DC-3 ever crashed from a structural failure.
Note: The Aero Art Caricature logo is in this image only to deter digital theft. It is not part of the print or poster.