At 16 kilometers from downtown, the Chicago Midway Airport is of service to more than 17 million passengers a year. They have three concourses which has their own airline and destination country. For Concourse A, it serves ATA, ATTA connection, Northwest Airlines, Chicago Express, Southwest Airlines, Frontier Airlines, and Ted, with gates from A1 to A19. Concourse B has Comair, AirTran, ATA, Delta and Southwest Airlines, with gates B1 to B26. At Concourse C, they have Continental Airlines, and American Airlines, C1 to C3.