By Everett Potter It’s hardly news that many travelers are concerned about germs and diseases when they fly these days, especially in the midst of the current Ebola virus crisis. But in the airborne petri dish that contemporary aircraft have become, fliers may well be worrying about the wrong things.

By Everett Potter There are tarmac delays and then there are tarmac delays—just ask the Air Canada passengers who sat on a Vancouver runway for 12 hours a couple years ago. Food and water were rationed, and the cabin air was stifling. Even more torturous, the footbridge was still connected