United Airlines has a boarding system that helps passengers get on the plane in a managed way. People who need extra help, military members, and families with small children can board first. In Group 1, premium travelers and frequent flyers get to board early, with United Airlines Boarding Groups deciding when others can enter based on their seat and ticket type. Group 2 includes priority passengers and some credit card holders. After that, Groups 3 to 5 board in order—window seats first, middle seats next, and aisle seats last.