I was bothered about the air stewardess not being missed too, Abra1d.
Backinthebox - thanks for all that technical explanation - it made far more sense than their plot! Can I ask - if the pilots couldn't make contact with ATC, they would wait for the military aircraft to come and escort them to the airport, would they? They'd expect a 'rescue' mission?
Shotinfoot - Staverton suggested that Ruth might have been stabbed in the heart, which would be why CPR would have been useless - I was saying why I didn't think this was the case.
I'm not sure you always get frothy, bloody sputum with a punctured lung - but you would get shortness of breath, which Ruth did have. A stab wound to her stomach or intestines wouldn't cause shortness of breath so fast, I think, and wouldn't have been fatal so fast either.
Anyway - they had no way of knowing what organs had been stabbed, and in that situation - stab wound, casualty has stopped breathing - I would perform CPR just in case it would do any good - and I think that is what the ambulance men do too. When my dad collapsed at home, our neighbour did cpr for the half an hour+ that it took for the ambulance to arrive (very remote rural location), and the paramedic carried on with it for a while too, before Dad was pronounced dead.
I can't believe that Harry et al wouldn't do anything in their power, however slim the chances of it working, to bring Ruth back.