Travelers flying with Frontier Airlines have several check-in options. Online check-in opens 24 hours prior to departure, and this is the most recommended method since it allows you to secure a digital boarding pass and pay for luggage in advance. If you're checking in at the airport, Frontier’s self-service kiosks and counters are found on Level 3 of Terminal A (Departures level). ... https://airlinestermnals.com/frontier-airlines-mco-terminal-orlando-international-airport/