Allegiant Air provides a lot of service to its flyers, including trip flex. Moreover, Allegiant Trip Flex is a special add-on service provided by the Airline for the unexpected itinerary changes to flight destination, date, and time, etc, without charging any standard fee. Furthermore, flyers can cancel their tickets without paying a single penny to the Airline for boarding tickets. For more information about the Trip Flex, contact a live person at the customer service of Allegiant Air or read the blog provided by the Airlines Group Travel.