Nuisance Warning News Today

Became a nuisance warning because they had heard it intermittently before. they didnt know if it was valid or not and decided to disregard it. well never know. they never discussed it. >> reporter: the initial french investigative report states that a phenomenon called the startle effect may have played a role. >> it is similar to walking in to a room thats dark and somebody jumping out and saying boo. its that instantaneous scare, if you will. the auto pilot is off. why is it off? what do i nee...