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Allegiant Air MTJ Terminal+1-888-839-0502 At Montrose Regional Airport Allegiant Air MTJ Terminal is based out of the main terminal. All Allegiant Air travelers check in, go through security, and board their flights from the same terminal at MTJ because it serves as both an arrivals and departures terminal. When flying with Allegiant, passengers should arrive at least two hours before departure in order to finish the security and check-in processes. visit us : https://www.airportsterminalinfo.com/allegiant-air/allegiant-air-mtj-terminal-montrose-regional-airport/