| a. More frequent service than other airports within driving distance |
| b. Lower fares than other airports within driving distance |
| c. Availability of service at this airport by a low-fare carrier |
| d. High Density Rule landing/takeoff slot limitations at airports within driving distance have resulted in customers using this airport instead |
| e. Availability of regional jets at this airport |
| f. Availability of service to multiple hubs at this airport |
| g. Marketing and promotional efforts |
| h. Public has become more willing to fly as time has passed since September 11, 2001 |
| i. Improved highway access to this airport |
| j. No effective competing transportation modes (e.g., lack of good highway access to competing airports) |
| k. Other reason(s) |