United Airline has rather small overhead compartments and I had to check my carry-on because I was assigned Zone 4 boarding. And they played a movie with maximum flashing during a redeye flight. US Airways delayed my flight for more than 4 hours when there wasn't a storm.
And too much noise in the form of crowds and PA announcements gives me bloody headaches.
My iPod is a lifesaver. So does being able to simulate Rachmaninoff piano concertos in my head.