Spirit Airlines Terminal IAH operates out of Terminal A at George Bush Intercontinental Airport (IAH) in Houston and offers passengers a convenient and efficient travel experience. The terminal, which is famous for its low-cost service, provides a straightforward environment with necessary amenities, making it easy for travelers to board, check in, and pass security. Aside from comfortable spots to relax before their journey, Spirit provides a range of food alternatives, such as quick snacks and grab-and-go options.