Sorry, there's no scenario where you can ask people to be quiet unless they're yelling, or spouting profanity while you're sitting with your child. Same thing with the window shade. If you're not at the window and you ask the person sitting there to lower it - and they don't - there's nothing you can do.

+1: noise canceling headphones. Add some ocean sounds and you should be out.

All else fails, offer them a couple of your sleeping pills.