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No, Hertz isn't present at Ontario (ONT).
No, Avis isn't present at Ontario (ONT).
No, Enterprise has not car rental services at Ontario International Airport (ONT) according to our knowledge.
Yes, there are companies like 1st Car, Amazing, Fox Rent A Car, Hertz, Thrifty, Enterprise, Avis, Budget, Alamo, CNG Car Rental, or United Auto that's not located directly at the airport with either drop-off or shuttle service.