The federal government counts a flight as on-time if it arrives within 14 minutes of schedule. Here are the government's rankings of the 14 leading airlines and their on-time performance in April:

1. Hawaiian Airlines, 94.0 percent

2. Alaska Airlines, 90.3 percent

3. Virgin America, 86.5 percent

4. Delta Air Lines, 85.2 percent

5. AirTran Airways, 84.6 percent (asterisk)

6. US Airways, 83.3 percent (asterisk)(asterisk)

7. American Airlines, 82.3 percent (asterisk)(asterisk)

8. United Airlines, 81.8 percent

9. SkyWest, 80.9 percent

10. Frontier Airlines, 79.7 percent

11. JetBlue Airways, 77.4 percent

12. Envoy, 75.2 percent (asterisk)(asterisk)(asterisk)

13. Southwest Airlines, 74.2 percent (asterisk)

14. ExpressJet, 74.2 percent

Total for all reporting airlines: 79.6 percent

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(asterisk) owned by Southwest Airlines Co.

(asterisk)(asterisk) owned by American Airlines Group Inc.

(asterisk)(asterisk)(asterisk) formerly American Eagle

Source: U.S. Department of Transportation