My flight to DC included a large class of 8th graders on their school's annual pilgrimage to Washington DC. I would guess that there were about 30 of them and, as luck would have it, all sitting in the rows immediately in front of me. Since we know that groups regress, even with appropriate staff, once on the plane, they began acting like 6 year olds.
Not long after we took off, I figured out where they should be sitting. In the middle seats. No one else wants to sit in them, the kids would all be separated, and they might behave a little better if they sit next to "real" people and not just their peers.