The official app of Allegiant Travel & Allegiant Airlines. Book your vacation online at www.allegiantair.com, then use this app to make the most of your trip. Passengers can follow their trip on a card-by-card basis in the app. Each phase in the trip is represented as a card in a timeline of the whole journey. Just tap on the cards and follow the instructions to manage the trip, check in for the flight, display the boarding pass and get departure and arrival information. You can also book your