Southwest (incl. AirTran)
The airport pairs Southwest (incl. AirTran) flew from 1990 to 2025, busiest first, with both directions counted together. Counts Southwest Airlines Co., AirTran Airways Corporation together for every year.
Show on for the top routes, ranked by .
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Flying done for the airline by a regional partner, such as SkyWest for Alaska or United, is reported under the regional's own name and is not included. How airlines are grouped. Freight before 2003 leaves out most domestic FedEx and UPS flying: see known gaps in the data.