Couple other tricks for travelling, since airplanes are the worse for recirculating germs and viruses to all exposed passengers:
1) Take some disposable alcohol swabs with you and wipe down all surfaces around your seat, arm rests, tray tables ..... other passengers will look at you like you're paranoid, but it all helps.
2) This is kinda gross but, boogers are your friends when it comes to travelling (your own boogers, that is). Do NOT blow (or pick) your nose before you travel on a plane .... you don't want to have your delicate membranes exposed to viruses - there's a purpose for those boogers