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December 21, 2014

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In this May 8, 2013, file photo, groups of passengers wait at a United Airlines gate to board a flight in separate numbered lanes at O'Hare International Airport in Chicago. United has installed new bag sizers at airports and emailed its frequent fliers, reminding them of their carry-on size rules.

M. Spencer Green / AP

In this May 8, 2013, file photo, groups of passengers wait at a United Airlines gate to board a flight in separate numbered lanes at O'Hare International Airport in Chicago. United has installed new bag sizers at airports and emailed its frequent fliers, reminding them of their carry-on size rules.