My first flight ever I was seated between a sleeping nun and a drunk Asian man.
I was terrified for then hours and my bladder was hurting.
I made myself and my family a promise: Never ever again. We pay for bulkhead and no one will get us out of them seats.
Ah, but the prize-winning question is: which one were you afraid of?
(Can you tell I went to Catholic school?)
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You know, the more this argument goes 'round and 'round, the more bemused I feel about how much people are worrying about things that are VERY unlikely to happen. Rules are rules, and we should be prepared for all eventualities (which is why I carry mini-packets of cookies and wrapped lollipops while on planes -- even when my own children are NOT with me), but there is what COULD happen, and then there is what is LIKELY to happen, and as parents, we need to keep that in perspective.
In reality, children under 5 pretty much NEVER get seated alone. Older children, yes, but not little ones. because ...
The fact is that IME, in practice, an FA will move heaven and earth to get a preschooler seated with a parent. The FA's do not want the responsibility of keeping them happy and making sure that they do not disturb other passengers, nor do they want to have to worry about toileting them or caring for them in an emergency. (Because contrary to all that teeth-gnashing about a neighboring passenger not being willing to save your child, the rule is that the CREW are responsible for making sure that all passengers get the help that they need to get off the plane in an emergency. The FA's will save the children if they need saving, as the crew won't leave the plane until everyone is out. The rule about carseats is special because carseats can be tricky -- the FAA wants to be sure that the person responsible already knows how the latches on that seat work.)
I fly quite a lot, and I've never been on a flight where bribery failed to work to get a preschooler seated with one parent. Someone WILL move if the FA sufficiently sweetens the deal.
PS: I've been willing to cut Scuba some slack for awhile now, ever since he posted the ages of his kids. When they are that young it's quite hard to imagine a time when they will be fine on their own for awhile, but it comes sooner than most parents expect, and honestly, it's wonderful when it does, because your stress level decreases considerably.
PPS: The cookies and lollipops don't get gifted without parental permission, but mostly I give them to parents who didn't think to bring their own, and who are having no luck quieting a child without them.