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American Airlines is removing bag sizers from its gates across the country starting Monday to speed up the boarding process.
Despite the removal of sizers, airline staff will continue to monitor carry-on baggage in the lobby and at the gate.
Oversized items will still be required to be checked in before the flight, with existing size restrictions remaining in place.
Passengers are permitted one personal item, which must fit under the seat, and one carry-on bag, which can go in the overhead compartment.
This update follows the airline's introduction of new boarding technology last year, designed to detect if passengers attempt to board outside their designated zone.