Define 3-1-1

3-1-1. A rule devised by the Transportation Security Administration to limit the amount of liquids that can be carried aboard an airliner. The rule limits passengers to carrying only containers of three ounces or less that can fit into one 1-quart plastiuc bag and only one such bag is allowed per passenger. The rule was implemented in response to a plot to blow up airliners by bringing seemingly innocuous liquids on board and concocting a bomb in flight.

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