The main reason the Allegiant phone number 1-800 Allegiant™(866-664-9260)/ 1 (866) 664-9260 (Live Person) is often busy is because lots of people are calling at the same time. Allegiant Air serves many travelers, so they get a ton of questions and requests every day. https://wanderlog.com/view/cuivvnqmhe/why-is-the-allegiant-phone-number-busy