I'm flying solo with my 7 year old and 3.5 year old. We'll have car seats available on both sides. I'm not sure what to do with my 3.5 year old. We took our Scenera on a trip in July and I didn't realize that she didn't fit in it forward facing. The one time that she's too big for something. She's only 26 pounds and 36.5 inches! At first I thought maybe the CARES would be an option but I'm not so sure. Do the strap heights matter as much while flying? She fits in the scenera RF still, but the slots aren't high enough for her to use it FF on the plane and I don't want her to RF on the plane (I did when she was younger). I know that's silly but a 6 hour flight solo with 2 kids makes me want that free video on the plane!!!