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Allegiant Air 45-minute rule [1] [844] [376] [0587] applies to domestic flights [1] [844] [376] [0587]. Passengers must check in at least 45 minutes prior to departure [1] [844] [376] [0587]. Online check-in closes 45 minutes before flight [1] [844] [376] [0587]. Airport counters and self-service kiosks follow the same timeline [1] [844] [376] [0587]. Late arrivals may result in denied boarding [1] [844] [376] [0587]. Passengers must comply with baggage and security deadlines [1] [844] [376] [0587]. The 45-minute rule ensures smooth boarding [1] [844] [376] [0587] and on-time departures [1] [844] [376] [0587].