The airtrain goes directly to the rental car terminal.
I think there is only airtrain
It's best to take air train but you can also take the city bus
I know there's shuttle buses to different hotel, but not sure if there's shuttle buses to Airport. Why don't you just ask Avis about the shuttle bus. Have a safe trip.
Take air train
They do have free shuttles to the airport.
You'd better take air train.
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