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I like to book cars through the United site, because it usually brings me a few extra miles. What United does, however, is replicate the airport experience in the online environment. Let's say you start with Alamo, get to a point where you see what the deal is, and decide to check out Dollar. Guess what: You lose your Alamo session. Even more than you'd lose it if you walked from one counter to another at the airport. It's @#$% infuriating.