Alaska Airlines IAH Terminal, Terminal A. Alaska Airlines travelers can check in, drop off bags, and go through security at this terminal, which mostly serves domestic flights. Traveler lounges, shops, and restaurants are just a few of the attractions available at Terminal A. To guarantee that travelers have a seamless experience using the airport’s amenities, Alaska Airlines advises arriving at least two hours before departure. Travelers will also find Terminal A convenient because it offers quick access to ground transportation choices including ride-sharing and taxis.