Originally Posted by
lougord99
Book your flight first. Then, when you book the flight of the minor, the web site will ask you if anyone is traveling with the minor and will link your reservation.
^ This. Since it's usually better to have each person on their own reservation anyway (so you can reprice if there's only one cheaper ticket available), you just book the adult first, then the minor. Works fine on the new system as well (I booked an August trip with the family a few weeks ago)