A.D.
There was a mom that my sister told me about, that prepared simple art projects for her kids ahead of time, and they stayed occupied the whole flight. I know with my kids in the twos class and even with my one year olds at the daycare, once I pull out art projects for them, they will sit for the longest time. So, if you want more ideas on what you could do for that, let me know and I'll email you some things you can do for that.
Good Luck!!!
A.