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NEW YORK — United Airlines is getting tough on passengers with oversized carry-on bags, even sending some of them back to the ticket counter to check their luggage for a fee.
The Chicago-based airline has started a push to better enforce rules restricting the size of carry-on bags — an effort that will include instructing workers at security checkpoint entrances to eyeball passengers for bags that are too big.
In recent weeks, United has rolled out new bag-sizing boxes at most airports and sent an e-mail to frequent fliers, reminding them of the rules. An internal employee newsletter called the program a ‘‘renewed focus on carry-on compliance.’’