The government says the largest airlines canceled 1.9 percent of their U.S. flights in May, nearly double the rate in April and last May.
The airline industry said bad weather was largely to blame. Jean Medina, a spokeswoman for the trade group Airlines for America, said that nearly 8,300 flights were canceled due to storms in the Midwest and Northeast between May 8 and May 16, accounting for more than half of the month's cancellations.
Here are the government's rankings of the leading airlines and their on-time performance in May.
1. Hawaiian Airlines, 93.2 percent
2. Alaska Airlines, 89.7 percent
3. Delta Air Lines, 84.4 percent
4. AirTran Airways, 83.9 percent
5. US Airways, 82.1 percent
6. Virgin America, 81.8 percent
7. SkyWest, 78.7 percent
8. JetBlue Airways, 77.3 percent
9. American Airlines, 76.8 percent
10. United Airlines, 76.4 percent
11. Frontier Airlines, 73.4 percent
12. Southwest Airlines, 71.8 percent
13. Envoy, 71.4 percent
14. ExpressJet, 70.3 percent
Total for all reporting airlines: 76.9 percent
Source: U.S. Department of Transportation