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Allegiant Air is one of the major carriers, this airline, and the world’s largest ninth commercial airline in the United States. Allegiant Air recommends that you should arrive at the airport at least 2 hours before your scheduled departure time so that you can easily be checked in for your flight, through the airport security checkpoints, and at the boarding gate at least 1 hour before your scheduled departure time. Most passengers should be able to check-in online 24 hours before the scheduled departure time of the flight but remember that not later than 45 minutes before the departure time of the flight. You can grab your seat at the time of booking for a nominal fee ($ 0 to $ 74) for making sure comfort and position onboard your Allegiant Air trip.