Plenty of food and drink, and definitely some familiar blankets, toys etc for him.

Lots o little things to keep him amused too. Books, singing toys etc.

I strongly recommend making sure he is either sucking a dummy, or having a drink at take off and landing. its not worth taking the risk about the pressure in his ears.
If he is sleeping, my DH used to cup his hands over DS' ears really tightly. This is also a really effective way.

And don't worry about the looks from other people. Too bad for them

P.S Can I come too??