The 3-1-1 Rule for United Airlines follows TSA guidelines for carry-on liquids. Passengers can bring 3.4-ounce liquid containers packed inside one clear quart-sized bag, with one bag allowed per traveler. This rule helps speed up airport security checks and makes boarding smoother for domestic and international flights.

The 3-1-1 Rule for United Airlines follows TSA guidelines for carry-on liquids. Passengers can bring 3.4-ounce liquid containers packed inside one clear quart-sized bag, with one bag allowed per traveler. This rule helps speed up airport security checks and makes boarding smoother for domestic and international flights.