Convair Model 110

The Convair Model 110 was the first airliner design Convair drew up to replace the Douglas DC-3, prepared against a requirement from American Airlines. It was an unpressurised, all-metal, low-wing twin-engine monoplane with seats for 30 passengers, powered by two Pratt and Whitney R-2800 Double Wasp radial engines of 2,100 horsepower, with tricycle landing gear and a ventral airstair for boarding. The only prototype, registered NX90653, first flew on 8 July 1946. By then American Airlines had asked for a pressurised cabin and judged 30 seats too few, so Convair lengthened and thinned the fuselage into the 40-seat pressurised Model 240. The prototype was used for development work on the 240 series and was broken up in 1947.