Opinions expressed by Entrepreneur contributors are their own.
Persuading a car rental agency to give you an upgrade can be asdifficult as upgrading from economy to business class on a flight.With profits soaring at most rental agencies, managers aren'tgiving up any more than they have to.
"The big car rental companies are cutting costs in allareas--including promotions and giveaways," says Darrin Deanyof Northbrook, Illinois-based corporate travel agency BTI AmericasInc.
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