I thought I better let you all know that my head did not actually explode while trying to buy those airline tickets. It came mighty close when the nice airline lady told me that unaccompanied minors must fly between 6:00 am and 7:00 pm (after I had picked out a flight landing at 10:00 pm).
But it's all over now! The tickets have been purchased. The accompaniment has been arranged and my oldest girls will be heading east in a month's time. And, my head is still intact.