That's not actually true. Airlines generally follow the procedures set forth by the manufacturer, and they do talk with each other quite a bit. I think what yo

That's not actually true. Airlines generally follow the procedures set forth by the manufacturer, and they do talk with each other quite a bit. I think what you mean to say is that this is plausibly, _likely_ to be a failure on the part of United, not Boeing. However this would not be the first time that manufacturers like Boeing recommend inadequate or faulty maintenance procedures. Only time will tell.