They did and it is documented. Mentioned in this film: * https://www.pbs.org/wgbh/frontline/documentary/boeings-fatal-flaw/ https://www.pbs.org/wgbh/frontline

They did and it is documented. Mentioned in this film: * https://www.pbs.org/wgbh/frontline/documentary/boeings-fatal-flaw/ https://www.pbs.org/wgbh/frontline/documentary/boeings-fatal...