When we flew last year (dh, me, and the kids), we brought on both carseats. What a hassle to get two sleeping kids and two carseats OFF of the plane! When I flew with my brother and both kids when we moved down here (DH was already here) I checked both carseats at the gate and had Rebecca in my lap, Justin on the regular plane seat. He was the same size and age as your daughter is now.
If you want to take both carseats, maybe try to get a seat in the front of the plane so you're not bumping them into everyone on the way back...and plan on being the last to exit the plane. If you dont' bring a carseat on the plane for your baby, at least you can all sit in the same row, otherwise you'll have to sit separately.
Remember too that if you are checking them at the gate or carrying them onto the plane, you will be trekking through the airport with two kids and two carseats, so you may want to check a stroller at the gate to help. You can either put one or both of the kids in the stroller, or the carseats, and carry the rest. A sling is good too, but if it's a long walk with the carseat it's hard on your back. At least it was for me.
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