| Airports | |
|---|---|
| Intercity rail only | 2 |
| Commuter rail only | 5 |
| Heavy rail only | 7 |
| Light rail only | 4 |
| Intercity and commuter rail | 2 |
| Intercity and heavy rail | 1 |
| Commuter and heavy rail | 1 |
| Intercity, commuter, and light rail | 1 |
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Preliminary Intermodal Connectivity Database, July 2007.