I am in quite good health, am an avid handwasher, never touch my eyes, nose or mouth, etc, etc. And I can tell you that all that is not enough to keep you healthy on a flight! I get sick after every flight of more than about 2 hours, and otherwise never get sick. Over 3 1/2 years ago I flew from Atlanta to Los Angeles with a sick couple and infant behind me and a sick man across the aisle from me. Even though I had taken Airborne and vitamin C AND covered my headrest and taken every precaution, by the time I had landed and taken a 2-hour car ride to my destination, I couldn't even walk. I collapsed in the floor of the home I was staying at and couldn't get out of bed for the next two weeks. It was the worst flu I had ever had in my entire life. Even worse, when it was over, I continued to cough and have a "bad chest" for 3 months; and I developed a horrible sinus condition that has NEVER gone away. Airlines need to screen passengers. If they feel they must allow contagiously ill passengers to travel, they should isolate them at the back of the plane or something. I hope you fare better on your flight!