Allegiant Air provides insurance for the passengers in the case of uncertainty during the journey through trip flex features. With the help of Allegiant Tripflex, passengers can modify their travel dates, times, or even destinations once, up to one hour before departure. Moreover, they can make all these changes without paying a change fee of $25. For more details about how to get trip flex service and its related guidelines, visit the official website of Allegiant Air or read the blog at the aforementioned link.