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In addition, passengers must be prepared to present a local, state, or federal government-issued identification card at the boarding gate, along with the boarding pass.
CNN: FAA imposes new luggage restrictions
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Finally, the ID card is flashed at the gate no boarding pass needed and agents there hand the traveler a receipt with the seat number printed on it.
WSJ: Flying Through the Airport
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When a traveller enters an airport with one of these smart cards, sensors read the passenger's card and automatically send a gate number and electronic boarding pass to the passenger's smartphone.
BBC: In brief: Ash cloud threatens UK flights