Cosmopolitan Airlines was an FAR Part 121 Supplemental Air Carrier airline which served both commuter and charter flights. The airline operated from 1978 to 1983, with flights ending in 1980. It flew three Convair 440 planes, which were available for public charters, and Cessna 310s for the scheduled commuter flights to Boston (FAR Part 135 operations). During the summer months the airline, chartered by Trans East International Airlines (also based at Farmingdale Republic Airport), flew scheduled flights from La Guardia to Nantucket and Martha's Vineyard.