| Rank | Month | Scheduled flights | Weather cancellations | |
|---|---|---|---|---|
| Total canceled | Percent canceled | |||
| 1 | Feb-10 | 481,988 | 20,206 (6,824) | 4.2 (1.4) |
| 2 | Feb-07 | 565,604 | 15,872 (13,554) | 2.8 (2.4) |
| 3 | Jan-06 | 594,924 | 15,748 (13,782) | 2.6 (2.3) |
| 4 | Dec-09 | 529,269 | 9,791 (10,887) | 1.8 (2.1) |
| 5 | Dec-08 | 544,956 | 10,038 (16,683) | 1.8 (3.1) |
NOTE: Numbers in parentheses represent weather-related delays.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Airline On-Time Performance Database, February 2010.