I took a Cathay Pacific flight once where a woman in business class used moisturizer from the amenity kit prior to departure, and complained to a flight attendant that it was causing her skin to break out. It sounded like she wanted special treatment or compensation, maybe an upgrade to first class. Cathay made the woman deplane — since the last thing the airline wanted was for a medical emergency to occur midflight and cause a diversion.
Etihad recently took an ever stricter position with regard to fear of passenger illness: A teenage girl was leaning against her mother at check-in at the Manchester airport in the U.K. She was pale, because she’s Scottish. So Etihad felt she might not be fit to fly.