Don't fly American if you have any health issues...

Even presuming oxygen would have saved her, and even if it was the responsibility of the flight attendant, Joint and Several liability . . . most likely, the airlines outsource to some shloemoe O2 company, and thus by outsourcing regulater maintenance, hydrostatic testing of the bottles, etc, they pass it on (their blame/vault) to the other guy ... who in turn, has an errors/omissions policy in effect in most cases. The insurance company eats it, either for the airlines or the maintenance company, who passes it on to their customers, who in turn, pass their costs (plus a little extra) on to YOU.
Welcome to capitolism. Doesn't it feel good knowing that WE paid, "in the end".

 

That's why I fly Northwest or Alaska
Or Delta for overseas.

 

As someone who flies first class, I'm not at all sure I like that procedure!

Hey! I want my olive. The meals are already microscopic. ... On the other hand most airlines won't provide a vegetarian meal any more anyway, and I have to bring my own food.

We call them Northworst. Absolute bar-none worst customer service of any U.S. airline, and a dreadful record for lost luggage. Northworst is the only airline that has lost my luggage when there was no change of airplanes involved.

Except that it turns out that all the equipment was functioning properly and the flight attendants did their job as well as could be expected.