Superterminal - consider the logic - supervise the drinking and keep it to non-excessive levels = no alcohol poisoning (if indeed that was the reason for the flight) = no 2 am sortie in a rush = no accident (whatever the cause) = seven lives saved just for the want of a little control.
If you believe three 21 year-old highschool/university girls from a country where they can't drink until 21 should be allowed unfettered access to booze, then maybe think about it a bit more before you become a parent of teenagers.