"You never go wrong by tipping big, " says Joe Brancatelli, who runs a noncommercial Web site for business travelers.
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Despite this, Brancatelli says he doesn't enjoy eating in airports--"airports by definition aren't great places to eat"--but admits that things are getting better.
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That said, Brancatelli notes that even if a hamburger is "street priced, " if it tastes worse than what you'd buy on the street, you'll inevitably feel like you've been overcharged.