My flying tips:
1. Travel with someone who also enjoys traveling.
2. Be well rested.
3. Drink tons of water the day/evening before so you are well hydrated.
4. Chapstick and hand lotion.
5. Bring your own entertainment, like downloaded Netflix shows.
6. Bring your own snacks.
7. Research the airports you'll need to navigate ahead of time so you don't stress yourself out.
8. Study the ground features as you take off and land. There are beautiful differences and unexpected sights you'll notice when looking for them, even in your home town.
9. Don't drink the alcohol, even when it's free.
Of course, if you are afraid of dying, heights, or falling I doubt any of these tips will help you.
My experiences are on short US flights from/to Orlando, so planes are generally filled with cheerful Disney-going people. This study was done by Europeans, presumably accustomed to European flights, whose "economy class" flights are pretty uncomfortable and bleak, at least from my very limited experience flying around Europe.