Yes. Cars picked up at the airport have an additional airport charge. Enterprise has been charging this additional fee for quite some time. There can also be a refueling charge and another reason could be that you chose the optional collision insurance. Grinnell College business trips are covered under the College insurance and therefore the optional insurance is not necessary. The academic and administrative offices, as well as Security, have copies of Proof of Insurance cards to be carried with you while driving a rental car. Proof of Insurance is required by the State of Iowa.