every third or fourth row at the same time. That way when the last row is getting situated so is the 4th to last and the 8th to last and the 12 to last. Then when the second to last row is getting situated so is the 5th to last and the 9th to last.....etc. Then you only have four groups have to board which is all much faster because of most of the plane not being able to get situated while one row gets in, it is 1/4 of the plane getting situated all at the same time. Okay maybe you'd have to have 5 groups. The 5th group would be the lates and morons that couldn't figure out the ordering.