Ultimately, it is providing a free service, and recognizes no liability for damage done by the withdrawal of that service beyond the cost of the service.

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Since the start of 2010, the highest number of complaints -- 18, 196 -- related to damage claims for checked bags, problems for which airlines and the TSA share liability. (It's also the area that experienced the biggest decreases in recent complaint tallies.) In second place, at 10, 187, were complaints about treatment of personal property at security checkpoints.

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