After years of tough rules on liquids and footwear, U.S. air travel may be on the cusp of a new era

When limits on liquids were introduced at TSA checkpoints across the country in 2006, bins overflowed with bottled water, toothpaste, shaving cream and so much more. Nearly two decades later, travelers are much more accustomed to the "3-1-1" regulations" governing the size of the liquids they're flying with, but scenes of passengers guzzling a beverage before putting their bags through the screening machines are still common.

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