Airlines are changing their rules on the size of carry-on luggage.
American Airlines and United Airlines issued a notice last week that their standards for carry-on bags have changed to the following new requirements: Maximum dimensions cannot exceed 22” length x 14” width x 9” depth.
Do note that a significant number of carry-on bags used today are over 14” width!
New sizers at check in will be the next step the airlines take to check oversize bags well before they arrive at the gate. If an airline decides to subject your carry-on to their sizer, they require your bag to get through it without being forced.
This policy is likely to spread throughout all the national airlines. Where one airline goes, the rest usually follow.