There are certain things one must always do/have when you travel.
1. Always travel comfortable.
2. ALWAYS travel in dark colors. It looks trashy if you don't!
3. Don't use the airplanes pillows or blankets.
4. Don't travel with many bags. It only annoys you and others, nothing positive.
5. Carry a book with you all the time and read.
6. Don't be noisy!
7. No sandals/gladiators. Airports are dirty use moccasins, ballerinas or any other closed shoe.
8. For long trips: SLEEP if you can, always carry your own slippers and eye-mask(its hygienic). Here i give you the best option from Lanvin: