In 2015, I was on flight EY23 that was first stranded on the the tarmac in Abu Dhabi because of fog for 13 hours and then diverted to Vienna because a passenger

In 2015, I was on flight EY23 that was first stranded on the the tarmac in Abu Dhabi because of fog for 13 hours and then diverted to Vienna because a passenger had a heart attack inflight. So a short 7 hour flight turned into 30 hours of horror. (http://www.thenational.ae/uae/elderly-passenger-dies-on-board-delayed-etihad-flight http://www.thenational.ae/uae/elderly-passenger-dies-on-boar...) It seems that some airlines have a very strict protocol. There were at least 4 doctors on board but they were not allowed to help the crew with CPR or help much more than with checking the blood pressure. Interesting enough, the crew was always connected to a company that has emergency-medicine specialists on the ground, so the crew became their remote hands.