Car rental question

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I was wondering if anyone had nay experience with Dollar car rental in Las Vegas. The reason I ask is I rented a car from there and I am due to pick it up at the airport. I was told that a shuttle would pick me up at the hotel and take me to the airport but I forgot to ask how much that costs or if it is free. I tried calling back but got impatient when put on hold! Does anyone know about this?