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Alaska Airlines slipped past rival Hawaiian Airlines to post the best on-time rating for U.S. carriers in July.

A total of 21 planes were stuck on the ground longer than federal rules allow — three hours for domestic flights, four for international ones.

Eight of the long delays were on Delta or Delta Connection and five were on United.

It was the highest monthly number of long delays in more than a year — since there were 24 in February 2015 — and it could mean fines for the airlines involved.

The Department of Transportation said Tuesday that 75.2 percent of flights on the 12 largest U.S. airlines were on-time during July. That’s down from 78 percent in June and 78.1 percent the previous July.

The department said 89.4 percent of Alaska flights arrived within 14 minute of schedule, while only 63.3 percent of flights on low-fare Frontier were on time.

The biggest four airlines finished in the middle of the pack, with Delta best in the group followed by United, Southwest and American.

Nearly 2 percent of all flights were canceled, including 2,300 on Southwest in the days after a computer outage. The cancellation rate nearly doubled from June.

Consumer complaints filed with the government continued to fall and represented a tiny fraction of the millions of airline passengers.

The transportation department said it received 1,963 complaints including 1,357 about U.S. airlines. The overall complaint rate fell 9 percent, complaints against U.S. airlines dropped 20 percent, and complaints about foreign airlines rose 19 percent compared with a year earlier.

1Alaska Airlines89.4 percent
2Hawaiian Airlines88.8 percent
3SkyWest82.9 percent
4Delta Air Lines81.6 percent
5United Airlines76.6 percent
6Virgin America75.4 percent
7Spirit Airlines72.8 percent
8ExpressJet70.9 percent
9Southwest Airlines70.8 percent
10American Airlines70.7 percent
11JetBlue Airways67.8 percent
12Frontier Airlines63.3 percent

Source: U.S. Department of Transportation
Note: The report does not cover smaller airlines including Allegiant Air and some regional carriers.

Copyright (2016) Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

This article was from The Associated Press and was legally licensed through the NewsCred publisher network.

Photo Credit: Alaska Airlines is flying more planes to sunny Hawaii, which always helps with on-time ratings. Alaska Airlines