I'm curious about this, too.
I chaperoned my son's band field trip last year and the tickets for our kids looked like regular tickets.
We are going in May (my husband and I are not chaperoning though - yay!) and I was hoping to add MaxPass to my son's ticket on the second day so he can at least get one ride on Mission Breakout. We are purchasing tickets through the school so hopefully, we can buy MaxPass, too. But I wasn't really worried about that until now.