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OIG Report, More Data Needed To Understand Flight Delays And Their Causes

December 18, 2013 - The causes and impacts of flight delays and cancellations continue to be a key concern for Congress, the Department of Transportation, the airline industry, and the flying public. 

In the Federal Aviation Administration (FAA) Modernization and Reform Act of 2012, Congress directed DOT’s Office of Inspector General to examine various delay statistics, air carrier scheduling practices, and airport capacity benchmarks (i.e., the maximum number of flights an airport can safely accommodate per hour).

OIG’s audit objectives were to analyze recent flight delay and cancellation trends, examine air carrier scheduling practices and their relative impact in causing flight delays and cancellations, and review the FAA’s use of capacity benchmarks to assess airport capacity and monitor airline scheduling practices at the Nation’s largest airports.

OIG found that overall, flight delays fell by 33 percent from 2000 to 2012, and the number of cancellations nationwide has decreased by 56 percent at the 55 major airports. However, data limitations hinder the FAA’s ability to track some of these delays or fully understand their causes. In addition, OIG found that air carrier scheduling practices have had a major impact on reducing the number of flight delays both nationwide and at specific airports, such as by increasing scheduled gate-to-gate times and reducing flight volume. 

However, over-scheduling and congestion remain a problem at several major airports, particularly in the New York area. Finally, OIG found that the FAA’s capacity benchmarks have proven useful for assessing capacity needs at major airports; however, the Agency has not shared them with outside stakeholders and the general public since 2004. 



OIG made five recommendations to the Office of the Secretary of Transportation (OST), The FAA, and the Research and Innovative Technology Administration (RITA) to improve the collection, reporting, and communication of flight delay and other related data. The agencies concurred with three of our recommendations and partially concurred with two. Based on their responses, OIG consider all recommendations resolved but open pending completion of planned actions.
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