| J.F.K. tenants |
| O'Hare tenants |
| O'Hare competitors |
| Employers of "stews |
| Admirals Club carrier |
| American and the like |
| Certain elevated routes |
| Companies regulated by C.A.B. |
| Northwest and Southwest, e.g. |
| Some transportation companies |
| Users of hub-and-spoke systems |