The flight service provided by Allegiant Airlines is crucial when making online travel arrangements and cancelling them. It is a large American airline, and Las Vegas, in the US state of Nevada, serves as its corporate headquarters. It is reachable via a number of efficient flight choices and a top-notch air carrier. This airline is the largest commercial airline in the US. It is wholly owned by Allegiant Travel Company, according to the customer service expert, and offers a selection of customer service agents to help with the online flight service. So, if you've already bought your ticket and want to cancel it, you can get prompt support from its customer service. If you have booked a journey with Allegiant Air but are unable to travel due to significant personal obligations, you have the option of cancelling your flight. However, each traveller must be informed of a few rules that are a part of the Allegiant Air Cancellation Policy.