I was having the Cares Harness Vs Carseat debate too

I will be flying with my 2 year old to Europe next month. I used to take the carseat and strap it into the seat but 12 hours seemed too long for him to be in the seat....and it was impossible to keep him from kicking the seat in front of him. Plus, the tray table was useless cause we couldnt open it up all the way because the sides of the carseat were too high.

So this time I will check the carseat and rent a Cares Harness on Ebay.
(Incase you decide to take your carseat on board, check out the Go Go Kidz adapter...it makes travelling so much easier)