we just did a trip Adelaide - Brisbane and Cairns - Adelaide. DS would have just been 2yrs old. I'm so glad we got him a seat and not on my lap - we did that when he was about 13mths old and that was bad enough with the wiggling around and stuff. Although this time at one point I did have him on my lap for a feed and a sleep - it was the only way to settle him down at one point - rather excited about being on the plane and all the other people behind us.