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To lock out the one person who might have been able to thwart this disaster the plane's captain. want to bring in cnn aviation correspondent richard quest. richard, first, walk us through what these doors are supposed to do and how they are supposed to work. >> right. in doing so let me preface what you are now going to hear is talk about, we are not going to give away any great secrets. there is going to be no great revelations. everything is pretty much public knowledge and easily discernible. so what you are going to see here is the concept is to stop somebody from entering the cockpit and ...

Technology for years. it's convenient. now, you don't have to reach into your wallet, pull out a credit card. your phone, already in your hand, scan it and you pay for your item, you keep going. >> what if it's stolen? >> that's the problem. say, they're building the technology. the more convenient, the more risk out there in anything you do. what you have to do, very important. if you download this application, what you want to do, make sure you have your phone set up, password protected. if you ever set your phone down for five minutes, it goes into lock mode. if someone steals your phone, t...