My OH met a family at the airport last week. They had hired a car over the internet.
However...on their car hire document it had the name of the car hire company and then the address:
Sir Donald Bradman Drive
The car hire company did not operate from the airport (there are many that don't). Sir Donald Bradman Drive is a raod that runs past the airport but you would have no idea whether it was a short walk or quite a distance from the terminal building.
If you hire a car it's best to check whether they are based at the airport or whether they will bring a vehicle through to the airport and meet you there.
In this case it worked out as my OH gave them a lift to the car hire company (a few km away) but there is a real possibility that people could arrive and expect a car hire to be waiting for them. They would then find out that the company is some distance away and they would have to get a taxi or get the company to bring the car through....not a good situation after a long flight!