https://simpleflying.com/boeing-787-oxygen-concerns/ "A former Boeing employee has come out with allegations regarding the oxygen supply on the 787 Dreamliner. John Barnett, a former quality control manager at Boeing’s South Carolina factory, says that some 25% of the emergency oxygen systems installed in Dreamliners could be defective. Boeing denies the claim." I don't know enough about the issue to comment. Anyone else have input?