budget-friendly image 40 consecutive years Southwest Airlines Fact Sheet Fleet Hoja de datos as Southwest’s fleet is 67% "Southwest/AirTran Top Ten Airports by Departures" one of Southwest's three busiest airports is the busiest airport Southwest Airlines Fact Sheet, Retrieved July 19, 2013 Hoja de datos airline 80% full 100 million customers annually Southwest Corporate Fact Sheet "Southwest/AirTran Top Ten Airports by Departures" Boeing 737 Southwest Airlines Fact Sheet, Retrieved July 19, 2013 Boeing 737s and 717s in its fleet Boeing 737 swamedia.com Boeing 737 "Southwest Airlines Fact Sheet; 30 June 2013" Southwest's busiest airport Southwest Airlines Southwest Airlines Fact Sheet Fleet as Southwest’s fleet is 67%