3. American Airlines (USA) – 144.9 million passengers carried
American Airlines is a major American airline headquartered in Fort Worth, Texas, within the Dallas-Fort Worth metroplex. American Airlines is a founding member of Oneworld alliance, the third largest airline alliance in the world. Regional service is operated by independent and subsidiary carriers under the brand name American Eagle.
2. Delta Airlines (USA) – 145.9 million passengers carried
Delta Air Lines, typically referred to as simply Delta, is a major American airline, with its headquarters in Atlanta, Georgia. The airline, along with its subsidiaries and regional affiliates, operates over 5,400 flights daily and serves an extensive domestic and international network that includes 304 destinations in 52 countries on six continents, as of October 2018. Delta is a founding member of the SkyTeam airline alliance.
1. Southwest Airlines (USA) – 157.7 million passengers carried
Southwest Airlines Co. is a major United States airline headquartered in Dallas, Texas. The airline was established in 1967 by Herb Kelleher as Air Southwest Co. and adopted its current name, Southwest Airlines Co., in 1971, when it began operating as an intrastate airline wholly within the state of Texas, first flying between Dallas and San Antonio. The airline has about 58,000 employees as of September 2018 and operates about 4,000 departures a day during peak travel season.