My flying stats for 2017: total flights: 66 flights taken alone: 65 airports: 46 cities: 40 countries: 24 time in the air: too much time in airports: far too much carbon footprint: I'm so sorry Fun facts: I never once reclined my seat, ate a meal or used a bathroom on a plane…
Hard to know which ones I can attribute to flying, but I haven't been particularly ill. Aside from my anecdotal single-datapoint evidence, I did read that airplane/aircon contagion is a myth, though I have no sources to cite on that...