Matt.Why are you yelling?
Whats this crap about vomit on shoulders? Students throwing up is very rare, and even rarer for them to chuck up on the instructor. I have a couple thousand hours instructing and have never had any form of body fluid expelled on me.
If hubby is having issues with this then i sugest a career change, 300 people in a jumbo all chucking up is gunna cost the airline a mint in cleaning.