Airlines in the US do this: your printed boarding pass will have a group number on it, and you board when your group's number is called. It still doesn't reall

Airlines in the US do this: your printed boarding pass will have a group number on it, and you board when your group's number is called. It still doesn't really help, and still creates a situation where people jockey for the earliest position within their group, or try to sneak in during an earlier group's boarding time. Southwest takes it a step further and puts both a group and a position number within the group and has passengers line up by number, so that the plane boards strictly in that order (i.e., passenger A1 boards, then passenger A2, then passenger A3, etc.). But the group and position numbers are determined by check-in time, which moves the rush to check-in (and the first few numbers can be purchased outright for a fee).