Before you head to the airport, surf the airport authority Web site to see which lots still have spaces available. Better yet, check AirportDiscountParking.com and make a reservation at a privately run lot.

For example, economy-lot parking at Chicago's O'Hare airport costs between $9 and $13 a day. But at the AviStar facility near the rental-car lots, you may pay as little as $8 a day for valet parking if you book far enough in advance. Other perks include luggage assistance, free espresso, and a wash, wax and detailing for your car while you're away.

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