Departure date is the first record of a day, Arrival Date is the next record in the same day if exists, then the next record is an Arrival date.
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In general, most airlines recommend being at the airport at least two hours before departure. However, keep in mind here that long walks from the terminal to the gate, or long lines at security checkpoints can easily add up to 30 minutes.
Depending on the requirements of airport authorities, you will need to present a mobile boarding pass, a paper boarding pass printed out by you or a paper boarding pass picked up from the check-in desk.
If you don't check in, you won't receive a boarding pass that allows you to board the plane, and your seat might be given up to a standby passenger. The check-in process also confirms your traveler details like your passport information and frequent flyer number.