For Allegiant flights, passengers have the option to either print their boarding pass or use a digital version on a mobile device. Allegiant offers online check-in, which typically opens 24 hours before the scheduled departure time. During this process, passengers can obtain their boarding passes, and choosing a paperless option can be convenient for those who prefer to travel light. However, if a passenger would rather have a printed version, they can easily print it at home. It is important to note that Allegiant recommends checking their official website for specific details regarding boarding passes and check-in procedures, as policies may vary and could change over time.