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Why Customers May Not Like Unitedâs New Carry-on Rules. United Airlines will become the first big U.S. airline to limit low-fare customers to one carry-on bag that fits under a seat, and will defer delivery of dozens of planes from Boeing as part of a push to boost profits. The announcement on Tuesday could frustrate flyers who already feel burdened with airline travel restrictions and fees.
Some of the four-wheeled carry ons that do fit all airlines' limits are the Briggs and Riley U122CX Baseline at 21 by 14 by 7.7 inches and 8.9 pounds (approximately $469) and the Travelpro Platinum Magna at 21 by 14 by 9 inches and 7.6 pounds (approximately $239).hese new size limits are recent. In fact, United made the change on March 2, 2014. Its previous policy was that no dimension could be over 22 inches and the total overall dimensions no more than 45 inches.