Agreed.

The obvious move for FlightCar is to partner with nearby garages, and offer a valet service to drive passengers to their terminals. To sweeten the deal, FlightCar might offer to wash or do basic maintenance (oil change) on the car for an added fee.

The passenger gets

  - convenience of getting dropped off at terminals (vs. walking from airport parking)
  - convenience of taking advantage of car "dead time" to get cleaned / serviced
  - some money (from the rental), to boot