DC-1 NR223Y after its record flight across the US using the Lear Model L Lear-O-Scope, which was a direction finding loop for navigation. The loop is visible on the cabin roof. NR223Y was sold to Howard Hughes for a his round-the-world but he used a Lockheed 14 instead. The DC-1 was then sold in the UK as G-AFIF. It ended up in Spain. The William P. and Moya Olsen Lear Papers / The Museum of Flight

The forerunner of all Douglas Commercials. The sole DC-1 on the day of its first flight from Santa Monica - 1 July 1933. Note the initial aerodynamic strut between fuselage and engine cowling - soon deleted. At date of image, the aircraft was owned by Douglas Aircraft. Quickly passed to TWA for airline tests. Photo: Douglas Corporation.

The future of air transport is ready for boarding. Photo from: San Diego Air & Space Museum

The sole Douglas DC-1 during tests after its first flight from Clover Field, Santa Monica on 1 July 1933. This head-on shot shows the slender slab-sided fuselage and the squarer-tipped wings of this prototype aircraft. See other image for further information. Photo obtained from Douglas.

The forerunner of all Douglas Commercials. The sole DC-1 was ordered by Howard Hughes for TWA and first flew on 1 July 1933. Here used by the airline for tests before delivery for commercial use on 15 September 1933. Bought by Hughes in 1936. Later to G-AFIF, EC-AGN and EC-AAE being damaged beyond repair in a forced landing at Malaga with Iberia in December 1940. Note the slender slab-sided fuselage, original fin shape and spatted tailwheel. Photo obtained from Douglas.