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There's a somewhat similar thread on the AA board re: bottles of booze being removed from the JFK Flagship Lounge. Whether one calls it theft or not, it is definitely against New York State licensing laws to take alcohol from the lounges into the terminal.

While I'm here, I'll admit to have occasionally taken crisps, biscuits, fruit cake, the odd magazine and even those little packets of ketchup from the BA Flounge, but never really considered it theft. However, I wouldn't dream of taking whole bottles and/or glasses.