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I think there was a report recently when there was another plane mishap where it came to light that those masks don't work for that long. what do you know about that? >> for a short period those mask was work. they would deploy if you lost cabin pressure and passengers would put those over their mouth. there would be supplemental oxygen. a lot of times the bags don't appear to inflate and will give the passenger the impression air is not going through there or oxygen isn't going through there, but actually it really is. was it from lack of oxygen or panic? you don't know what's going on. >> st...