Thanks everyone - they'd be fine apart from each other or me but I actually would feel bad for the poor soul one of my twins ends up next to... LOL. The kid never stops talking

If there's any question I'll just buy the regular fares. I'm thinking there has to be some policy in place though. I mean, if they'll allow you to designate a child as say 3 when booking and sell you a separate "saver fare" ticket, I can't imagine they would separate that child from their parent and put him/her next to a stranger? If it were this easy to have strangers watch my kids while flying I wish I would have figured it out years ago!