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MAINLINE PASSENGER AIRLINES IN UNITED STATE

1-Alaska Airlines (Founded April 14, 1932; 90 years ago (as McGee Airways)

1-Alaska Airlines (Founded April 14, 1932; 90 years ago (as McGee Airways)

2-American Airlines (Founded April 15, 1926; 96 years ago (as American Airways, Inc.)

2-American Airlines (Founded April 15, 1926; 96 years ago (as American Airways, Inc.)

3-Delta Air Lines, Inc. (Founded March 2, 1925; 97 years ago, as Huff Daland Dusters in Macon, Georgia)

3-Delta Air Lines, Inc. (Founded March 2, 1925; 97 years ago, as Huff Daland Dusters in Macon, Georgia)

4-Frontier Airlines (Founded February 8, 1994; 28 years ago)

5-Hawaiian Airlines (Founded January 30, 1929 (as Inter-Island Airways)

6-JetBlue Airways Corporation (Founded August 1998; 24 years ago (as NewAir)

7-Southwest Airlines Co (Founded March 15, 1967; 55 years ago (as Air Southwest)

8-Spirit Airlines Inc. (Founded 1983 (as Charter One Airlines)

9-United Airlines, Inc. (Founded April 6, 1926; 96 years ago (as Varney Air Lines in Boise, Idaho, U.S.)

9-United Airlines, Inc. (Founded April 6, 1926; 96 years ago (as Varney Air Lines in Boise, Idaho, U.S.)