I'm from the UK and I'd put it at 4 or 5. Basically completely unacceptable but when it comes to health and safety there is almost no limit to how dangerous you

I'm from the UK and I'd put it at 4 or 5. Basically completely unacceptable but when it comes to health and safety there is almost no limit to how dangerous you can make a situation. 10 would be depressurising the cabin and giving passengers warm clothes and oxygen masks and hoping enough of them survive that you still make a profit.