American Eagle, Delta Air Lines, Silver Airways and US Airways operate direct flights to Key West International Airport as of October 2015. JetBlue, United, British Airways, KLM and Air France have codeshare agreements with these airlines that allow them to operate connecting flights to Key West.
American Eagle, the regional arm of American Airlines, flies to Key West from Miami, Florida. Delta Air Lines flies to Key West from Atlanta, Georgia. US Airways operates flights to Key West from Charlotte, North Carolina and Reagan Airport in Washington, D.C. Silver Airways flies to Key West from the Florida cities of Fort Lauderdale, Fort Myers, Orlando and Tampa.
Key West International Airport is notable for its 4,800 foot-long runway, one of the shortest runways of any commercial airport in the United States. The limited length requires airlines to either use smaller aircraft or fly at partial capacity, which causes some carriers to shy away from flying to Key West. Other airlines that have previously operated flights to Key West, such as Southwest Airlines, have not achieved enough profit to justify using the airport. Southwest Airlines only experienced an average occupancy rate of 70 percent, although its national rate was 80 percent at times.