A flight attendant at the Airport Holiday Inn was suffering an allergy attack. She couldn’t fly because of the congestion, and her airline required a doctor’s exam and note. This is a common request which I fulfill regularly, but I couldn’t fulfill hers because she was American.
When a British Air, Quantas, or Cathay-Pacific crew member falls ill, the local supervisor calls on a national housecall service or individual (in Los Angeles, me), and the airline pays. US airlines don’t do this. Their employees are on their own. I occasionally make a charity visit to an American flight attendant too sick to leave the room but not sick enough for the paramedics. Mostly I refer them to an urgent care clinic.