The average age of U.S. airlines' fleets:
Allegiant Air: 21.5 years
Delta Air Lines: 16 years
American Airlines: 15.1 years
United Airlines: 15 years
US Airways: 12.8 years
Hawaiian Airlines: 12.1 years
Southwest Airlines: 11.7 years
Continental Airlines: 10 years
Alaska Airlines: 7.7 years
Frontier Airlines: 6.3 years
JetBlue Airways: 5.8 years
Spirit Airlines: 4.2 years
Virgin America: 3.4 years
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Source: Ascend Worldwide Ltd.
(Copyright 2011 by The Associated Press. All Rights Reserved.)









