I saw many people who had advanced heart disease and I was so frustrated because I knew if they just knew how to do the right thing simple lifestyle and diet steps that the entire trajectory of their life and health would have been different.
Air travel is the safest form of travel aside from walking even then the chances of being hit by a public bus at 30 000 feet are remarkably slim. I also have no problem with confined spaces. Or heights. What I am afraid of is speed.