1. headphones
2. gum (a strong mint can nuetralize disgusting odors from passengers) There is usually a fart or two that drifts through the cabin.
3. bring your own mini pillow
4. blindfold
5. book
6. And most imporatnly dont' be afriad to be a jerk if someone tries to start talking to you. A simple "I'm concetrating on this" will work.
Other than that. Flying sucks.