Concourse A has 37 Gates and is used by all international airlines and international arrivals. It is used by British Airways, Aeromexico, Air Canada, and Lufthansa. Denver is one of the busiest airports worldwide with only limited international operations. Frontier, DIA's #2 carrier, American, AirTran, Alaska, and JetBlue operate from here as well. It is connected to the main terminal by a bridge called "Lorenzo's Bridge" which though rarely used as such can accomodate an airplane up to A320 size underneath. It is so named as Continental was a hub carrier at Stapleton and insisted on the close end Concourse A at DIA. Instead CO closed its hub with the move to DIA.