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Frontier Airlines operates from Terminal A at LaGuardia Airport (LGA). This terminal, also known as the Marine Air Terminal, offers a smooth check-in experience with easy access to security. Passengers can enjoy limited but essential amenities, including dining and seating areas. It's recommended to arrive early, especially during peak hours, for a hassle-free boarding process. If you're wondering, what terminal is Frontier Airlines at LGA, it's Terminal A.