Originally Posted by mechteach

Personally, I would do the initial split of 2 and 2: there are plenty of times I've seen PN=2 space, and not many where I've seen PN=4.

Of course, PN=1 is even more common, but the reason I lean against doing that relates to check-in down the road. For an int'l flight, if a kid is on a separate PNR, you probably won't be able to check in ahead of time for that child. I would still monitor the flight like a hawk, though, and if PN=1 appears, that would be worth the added check-in hassles for me.

(This is just my perspective as someone who has booked and flown many trips as a family of 4 with 2 1ks and 2 children over the years; YMMV with your GS status.)