On this date in 1947, the Convair CV-240 made its initial flight from Lindberg Field, San Diego, California. It all began with American Airlines' requirement to replace their fleet of Douglas DC-3s. Featuring a more modern design with cabin pressurization, the 240 series was a success. The 240 had a long development cycle that produced many variants during a twenty-plus-year period for civil and military use worldwide. The final 600 series used Rolls-Royce Dart turboprop engines with four-blade propellers, replacing the piston engines with three-blade propellers.
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