Since they are over 11 years old they can travel alone no add on fees and no parent required to check them in. Back when I was under 18 it asked me to enter my parents information to book the flight but that's just in case of an emergency I checked in and boarded just like any adult passenger back in those days. Also since they are under 18 they don't need any ID to get through security but it doesn't hurt to have a school ID just in case. -Blake
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