The Sad Truth About Flying
If you suffer a cardiac arrest during a long-distance airline flight, oxygen isn't going to save you. Airlines don't always have medical personnel aboard, unless a Good Samaritan physician happens to be on the flight and agrees to come forward and help (hopefully it's not a Dermatologist or Pathologist). A defibrillator might buy some time, but not in every case. Even if the AED happens to restore a functional heart rhythm, it still cannot treat the underlying disorder, which is often fatal despite the most appropriate land-based treatment in our modern emergency departments.
Airlines do not carry a full complement of ACLS drugs or, to Nurse K's chagrin, cath labs. The 30,000 feet-to-balloon time is completely unacceptable. They can't check an ECG or monitor the cardiac rhythm, and they don't even stock thrombolytics.
I'm sure a lawsuit will be brought against American Airlines in this case, but the sad truth is that if you have a cardiac arrest when you're 30,000 feet over the ocean, then you are likely going to die whether the oxygen tanks are working or not.