|On-time flight operations (percent)||79.4||82.5||82.3||81.6||81.5||78.6||74.5||77.7||77.2||76.1||72.6||77.4||82.1||82.0||78.1||77.4||75.4||73.4||76.0||79.5||79.8||79.6||81.9|
a Data include nonstop scheduled service between points within the United States (including territories) by U.S. air carriers with at least 1% of the total domestic scheduled service passenger revenues and those carriers that report voluntarily. In 2010, the air carriers were Airtran, Alaska, American, American Eagle, Atlantic Southeast, Comair, Continental, Delta, ExpressJet, Frontier, Hawaiian, JetBlue, Mesa, Pinnacle, Skywest, Southwest, United, and US Airways.
A flight is considered on time if it arrived less than 15 minutes after the scheduled time shown in the carriers' Computerized Reservations Systems. Canceled and diverted operations are counted as late.
Since merging with Delta, data for Northwest Airlines are included under Delta as of January 2010.
Effective January 2012, data of the merged operations of United Airlines and Continental Airlines are combined.
Effective January 2012, data of the merged operations of ExpressJet Airlines and Atlantic Southeast Airlines are combined.
Effective January 2011, Comair and Pinnacle Airlines are no longer ranked in the source.
U.S. Department of Transportation, Office of Aviation Enforcement and Proceedings, Aviation Consumer Protection Division, Air Travel Consumer Report (Washington, DC: Annual February Issues), table 1a, available at http://www.dot.gov/airconsumer/air-travel-consumer-reports as of Feb. 19, 2013.