Thanks ladies. I think I'm going to have to pack lots and lots of snacks. DS doesn't really play with toys, unless you count our cell phones, remote controls, laptop, etc.
He has a couple of cars that he likes, but they don't entertain for long. He doesn't draw, but maybe one of those magnetic MagnaDoodle things would work. I think I saw a cheap one somewhere. He's all about running around and chasing the dogs, the birds, the butterflies, us! He's a super busy little guy and even staying in the house for a day drives him bonkers. He will nap, but rarely when there are other people around, so I'm concerned about his inability to nap on the plane. Thankfully he's still nursing, so boobies may keep him busy for a minute or two here and there. He loves to eat, so I'm hoping that snacks keep him occupied. And we're flying Turkish Airlines, lots of baby-loving Turks to keep him happy, I hope. We did manage to get bulkhead seats (or so DH says), so we'll have a bit of extra room there.
Any other suggestions? Keep 'em coming!