Yup, unaccompanied minors get a meal, and I am guessing parents may well pre-buy a voucher for children who are travelling alone but not on the unaccompanied service. I will probably flying with a child in tow (not mine, just a random one along for the ride ) this fall, so looking forward to the "pleeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeease will you buy this, that or the other" from duty free! I bet there are a fair few college students who don't have credit cards tho.