that. however, flight crews are no longer issued that key. initially we had the key, but tsa decided no key. >> reporter: all right. there is also when you look at the door from the outside, besides that key, there is the fact there is no real way to break in here. there is a key pad. tell me about that. >> that key pad is obviously a code that as you can see, the flight crews are given the code but it changes periodically. i can't tell you how often and whatnot. you put the code in and you have exactly 30 seconds to enter when that code is entered. if you don't get in within 30 seconds, it locks back out again. >> reporter: you can't get back in. besides that the pilot on the inside if he wanted to or if she wanted to they can make it so you cannot get in with a code. >> correct. you saw the deadbolt lock and two buttons to deny access.