Spirit Airlines Boarding Zones system, with each zone representing a different group of travelers. Zone 1 is reserved for premium passengers, including those with Big Front Seats and elite status members of Spirit's Free Spirit loyalty program. After Zone 1, Zone 2 is for passengers with upgraded services or higher fare classes. Zone 3 typically includes members of the Free Spirit program and those who purchased extras like "The Works." Zone 4 is for passengers with standard tickets who selected seats in advance. Finally, Zone 5 and beyond are for general boarding, which includes passengers with the basic “Bare Fare” who board last. This system helps ensure an organized and efficient boarding process.