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I saw my friend off at the airport.
How many hours before departure does check-in open?
My return flight is at night.
Has check-in for this flight already started?
I'm in line for the security check.
Please show me how to use the self check-in machine.
Please have your passport and ticket ready.
You need your booking number to check in.
The boarding gate has been changed.
I waited in the check-in line for thirty minutes.
This is over the duty-free limit.
I would like to check in with an aisle seat, please.