Air travel makes travellers sick. If my personal health were used in support of this thesis, it would be irrefutably proven.
I can't remember a flight I have taken where I didn't get sick and my recent all-night marathon from Dawson City was no exception. I was struck down with fever, coughing, a nose like Niagara Falls, sneezing with great frequency, and every joint in my body seemed to be providing further evidence with pained conviction.
My response: I will never fly again.