Only 20% of 737 Max planes were equipped with a key sensor that could have warned pilots.
Pilots were unable to correct “repetitive nose-down" movement of the aircraft
Investigators believe the same system malfunctioned in the Lion Air crash last October
Some experts suggest that the FAA’s close links to the airline industry make it look like the delay was politically influenced.
“Here we have a brand-new aircraft that's gone down twice in a year. That rings alarm bells in the aviation industry."