Alaska Air Group is an airline holding company based in SeaTac, Washington. It owns two certificated airlines operating in the United States: Alaska Airlines and Horizon Air.[3] The Alaska Air Group also oversees an aircraft ground handling company, McGee Air Services, which is wholly owned by Alaska Airlines.

Delta Air Lines, Inc., typically referred to as Delta, is one of the major airlines of the United States and a legacy carrier. It is headquartered in Atlanta, Georgia.[9] The airline, along with its subsidiaries and regional affiliates, including Delta Connection, operates over 5,400 flights daily and serves 325 destinations in 52 countries on 6 continents.[10] Delta is a founding member of the SkyTeam airline alliance.[10] Delta has nine hubs, with Atlanta being its largest in terms of total passengers and number of departures.[10] It is ranked second among the world’s largest airlines by number of scheduled passengers carried, revenue passenger-kilometers flown, and fleet size. It is ranked 69th on the Fortune 500.

Southwest Airlines Co. is a major American airline headquartered in Dallas, Texas, and is the world’s largest low-cost carrier. The airline was established on March 15, 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, Houston and San Antonio.[2][3] The airline has more than 59,000 employees as of June 2019 and operates about 4,000 departures a day during peak travel season.[4][5] As of September 2019, Southwest carries the most domestic passengers of any United States airline.[6] The airline has scheduled services to 101 destinations in the United States and ten additional countries. Its most recent expansion occurred in March, April, and May 2019 with service to Honolulu, Maui, and Kailua-Kona respectively. Southwest’s next planned service expansion is to Lihue on November 10, 2019,[7] and Hilo in January 2020.