The Allegiant Air Seat Selection Policy gives travellers two main choices: purchase a specific seat before travelling or allow Allegiant to assign a seat during check-in at no additional seat-assignment cost. Paid seat selection can be completed during booking or later through Manage Travel, while passengers who do not reserve a seat are assigned one from the remaining available seats. What Is the Allegiant Air Seat Selection Policy? Under the Allegiant Air Seat Selection Pol