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Scheduled passenger air transportation in the Producer Price Index: improvements and trends : Monthly Labor Review: U.S. Bureau of Labor Statistics
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The Cost of Air Travel in the US Has Been Remarkably Stable for the Last Decade, and 17% Cheaper Than 20 Years Ago | American Enterprise Institute - AEI
![Figure 5: Average Cost of Airfare for Domestic Flights Operated by Legacy Carriers (2010 dollars) - Q1 2000 to Q4 2010 | Bureau of Transportation Statistics Figure 5: Average Cost of Airfare for Domestic Flights Operated by Legacy Carriers (2010 dollars) - Q1 2000 to Q4 2010 | Bureau of Transportation Statistics](https://www.bts.gov/sites/bts.dot.gov/files/legacy/publications/special_reports_and_issue_briefs/special_report/2012_03_33/images/figure_05.gif)