Yes shouldnt have any problems
Yes. Shuttle busses run 24/7 from rental center to terminals.
Yes. The facility is open 24/7, including the shuttle. Make arrangements with rental company.
DFW has a shuttle from the rental car facility to the airport. I would check with them on dropping off cars off hours.
Some rental companies require you drop off your car at the same location it was picked up, big rental companies usually have shuttle service 24/7
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