The Douglas DC-1 was a one-off all-metal twin-engine transport prototype developed for Transcontinental & Western Air. Its pressurized cabin, retractable landing gear, modern instruments, and ability to demonstrate safe single-engine performance established the design direction that Douglas enlarged into the DC-2 and then the DC-3. The DC-1 is kept as its own prototype-design family because it was a distinct development article rather than a routine DC-2 production variant.
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