At least if you are parents of school aged children you have an option of whether to have your kids miss school or not. My DH is a teacher and we had booked for Aug 23-Sep 6 - flights already booked too. Since he, as a teacher, has no option to skip school, we are now faced with additional change fees plus additional costs in fares because we originally booked on a seat sale - at least an extra $1000 and possibly more since we are a family of five. Hardly seems fair when it was not a "risky" move to booke the last two weeks of summer - he's been a teacher for 18 years and NEVER has school started before Labour Day.
I might be wrong here, but aren't most teachers supposed to be setting up class the week before school starts? That's been my experience with my closest friends who are teachers. Maybe your dh's school operates differently? I assume since teachers have the entire summer off, vacation schedules can be flexible in your family? We had this problem about booking into september and had to pay to change our flights (ugggh).