Here are the government's rankings of the leading airlines and their on-time performance for May. The federal government counts a flight as on time if it arrives within 14 minutes of schedule.
1. Hawaiian Airlines, 92.1 percent
2. Alaska Airlines, 90.3 percent
3. Delta Air Lines, 88.6 percent
4. SkyWest, 85.1 percent
5. United Airlines, 83.7 percent
6. ExpressJet, 83.5 percent
7. Southwest Airlines, 81.2 percent
8. JetBlue Airways, 80.7 percent
9. American Airlines, 80.7 percent
10. Frontier Airlines, 80.2 percent
11. Virgin America, 76.7 percent
12. Spirit Airlines, 76.4 percent
Total for all reporting airlines: 83.4 percent