<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by UA_Eagle:
Already thought of that--I asked the car rental agency (Avis) about that and they said no. But I'll try again one or two more times and see what they say.
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UA_Eagle -- You may want to try Alamo, as (at least in the past) they charged no extra for renting at IAD and returning at BWI.