Before retirement I used to fly a lot both work and leisure. Mostly USA and Europe.
In recent years however I seem to get ill, maybe not every flight but very often. Coldy, snotty, fluey thing. Just back from a week holiday. Fell ill two days after arriving. Sore throat, snot, drippy nose, cough. Just about ok to fly back with lots of medication. Still coughing up gunge.
Is this now a thing that is maybe being kept quiet? or is it me? It doesn't happen when I drive abroad.
A slight allergy to the specific A/C system?
The A/C on foreign coach tour excursions from a cruise ship has affected me in the past, but this was more like tired eyes, sore throat and runny nose. I also felt a bit sickly, tired and generally worn out. When we got back to the cruise ship I just laid on the bed feeling rough, but halfway through the next day I was almost back to normal.