....parking revenue earned in the airport; revenue that is used for improvements and operations at the airport. ...The airport is rightfully sensitive to parking and commuter abuse.
DFW is banning drivers (for hire or otherwise) from idling at the terminal.....
Just like parking revenues, the airport uses revenues from taxi permits to improve the infrastructure at the airport. And too, the quality of the airport in and out experience is important to DFW administration. DFW Airport has shown that it will protect and control business activity within its property.
I think that this is a prudent decision.