Spirit Airlines Boarding Zones system to create an organized and efficient boarding process for passengers. When you check in, your boarding zone is printed on your boarding pass. The process begins with Zone 1, which includes passengers with Big Front Seats or those who have purchased Priority Boarding. After Zone 1, passengers in Zone 2, Zone 3, and further zones will board in order. This system helps avoid crowding and ensures passengers board in an orderly fashion, making the boarding process smoother and quicker for everyone.