The Alaska Airlines boarding groups system is broken down into several categories. Pre-boarding is the first phase, and it includes passengers needing special assistance, families with small children, and active-duty military members. Following that is Group A, which is reserved for First Class passengers and Mileage Plan elite members such as MVP Gold 75K and MVP Gold. Group B generally includes Premium Class passengers and MVP-level members, while Groups C through E are for the Main Cabin passengers, segmented based on seat location and booking order. This tiered system allows Alaska Airlines to load passengers in a logical and efficient order.