Are you staying there for one night, and flying out the next morning, or are you just trying to get out of paying the fee while you're there for one night? If you're flying out the next morning, or even if you're flying out without staying, but are staying there upon your return, ask about a park-and-fly rate. Most airport hotels offer this rate, and it's higher than the rack rate, as it figures in parking costs, but is still cheaper than paying for parking the entire time.