I always have my iPod with me, so I can play games even if there's no Internet connection. If the iPod battery runs out, I can play games on my cell phone, too. I don't spend much time in airports, but always have a book with me when I am traveling, and paper and pencil for sketching. The paper and pencil is also handy for playing games with antsy children - tic-tac-toe, or drawing together - I always have my "stealth crayons" - a miniature set of colored pencils - with me as well. And even the smallest of kids likes to scribble! And waiting parents are usually grateful for someone to help distract the kids.