An alert system that was supposed to be a standard feature on Boeing's 737 Max aircraft "was not operable on all airplanes," the company has said https://t.co/LdIF95ilyr https://t.co/XQoZHzr4we

An alert system that was supposed to be a standard feature on Boeing's 737 Max aircraft "was not operable on all airplanes," the company has said https://t.co/LdIF95ilyr https://t.co/XQoZHzr4we (via Twitter http://twitter.com/CNN/status/1123248183612669952)