Harry Reid International Airport's Terminal 1 is where spirit airlines las vegas terminal is based. Standard seats or Big Front Seats, which provide wider seats and up to 11 inches more legroom, are options available to passengers. Depending on the route and kind of seat, different costs apply. As an alternative, passengers can choose to check in and be assigned to a free seat at random. Big Front Seats offer a more roomy experience for people who want greater comfort, but they are more expensive."