Bloody hell - if someone said to me "would you like to go on a 3 week trip to the States all paid for, during work time, but it would mean 3 weeks away from your family"
That's the point though these trips generally aren't in work time. They are usually in the holidays, or if not certainly involve evenings and weekends.
Don't get me wrong, I enjoy school trips as a valuable part of my work. It would however be overstating it an awful lot to suggest that I go for fun or organise them for a bit of free travel for myself!
Bloody hell - why on earth aren't they sent home? Our high school makes the parents and the pupils sign a behaviour clause before any trip, and it's made very clear that they will be sent home at the parent's expense if they try any of that (and they are).
With respect this is a classic case of parent believing the party line. I'm sure that there have been a couple of extreme cases where children are sent home . (This in itself generates hours of work for the staff involved). This has sent the message that 'children must behave or else' to parents.
Which has probably improved behaviour on trips.
It certainly will not have eradicated the every day 'small' stuff the staff will be doing. And I bet you and I have a different tolerance for what would be counted as 'small stuff' on a school trip.
In short, obviously your teens tell you they were well behaved. Of course that's echoed in the school newsletter/ magazine.
The staff room walls would tell you a different story.