I find it interesting that airlines have air marshals on board to guard everyone's security but are unwilling to have a doctor on board to guard people's health and instead rely on the kindness of docs that happen to be on the flight, even though health issues probably happen way more than security issues. An airline should be terribly happy that someone helps them out and offer the person some form of appreciation (without the person having to ask them), even if only a bottle of wine or some miles. Just my 0.02