PreFlight Airport Parking coupons are available on the website's homepage at PreFlightParking.com. To access the coupons, simply click on the airport you will be flying out of — coupons are available right below the pricing information. They vary by airport, but all locations offer something as of July 2015.
Additional savings are available through two different programs. The Frequent Parker Program offers free parking (one free day for every six paid), airline miles (American, United or U.S. Airways), a guaranteed parking spot and corporate discounts. The Express Pass Program offers 15 percent off all PreFlight Airport Parking transactions for one year, the use of an express lane, e-receipts and other frequent parker benefits.