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all airplanes have this, a secondary barrier to add protection when the cockpit door is open and pilots leave for the bathroom or to get a male. >> studies have shown it takes three to five seconds to breach a cockpit. once inside, it's two seconds and the cockpit is taken over. >> i have been flying with united since 1997. >> reporter: this pilot says the doors give the crew extra time to react. right now, airlines use a food cart and a flight attendant to protect the cockpit. airlines believe current procedures are sufficient. but for this pilot and her union, it's not enough. >> when they have tested which is more effective, again, the secondary barrier wins out every time. >> reporter: but the international air transit association disagrees. >> there are procedures in place for entrance and exit from the cockpit. the doors themselves are very strong. and as long as the procedures