Convair 240 Central AirlinesConvair 240 Central Airline airplane model. The Convair 240 was an American airliner produced by Convair from 1947 to 1954, initially as a possible replacement of the ubiquitous Douglas DC 3. While featuring a more modern design, the 240 series was able to make some inroads as a commercial airliner and also had a long development cycle which resulted in a number of civil and military variants. Scale 1 72. Wingspan 15 inches, Length 12 inches.