What you need to know about Allegiant Air mobile apps
Like many other airlines, Allegiant Air offers an iOS app for all of your Apple devices. As the most popular mobile platform in the world, Allegiant Air has taken notice of Android and provided an app for most Android devices. Perhaps standard practice these days, the Android app offers the same functionality as the iOS app from Allegiant Air.
Also take a look at Allegiant Air's website by clicking here — you should be able to do what you need there.