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There’s a new snag at the airport catching fliers by surprise: the gate-service fee.

It’s not a fee to use a gate. (Maybe someday!) Instead, United and American have created a fee to discourage travelers who buy their cheapest fare, Basic Economy, from bringing a carry-on bag that doesn’t fit under the seat.

With Basic Economy on United and American, you lack privileges to put a bag in an overhead bin unless you have elite…