how does this contractor fit into the investigation because at the end of the day the buck stops with boeing. >> yeah, it does. with the faa we refer to the safety umbrella, which is the whole safety nut, everything underneath one umbrella and that includes all the subcontractors, whoever they send it out to, who have to adhere to all of the boeing safety practices, inspection practices, as well as everything that the faa mandates, even on their own. >> you talked about this along with many other safety experts regarding the design of this door plug and how it should be installed from the inside of the plane as opposed to the outside. tell me more. >> well, there may be reasons for why they did it this way, for -- to make it easier to come on and off, whatever the reason may be, but most doors and emergency exits are literally bigger than the hole that they fit into and they're installed