Baldwin. we have more details just coming into us on this midair emergency over new york state. it was this united express plane operated by sky west. had to make this emergency landing in buffalo, new york after leaving from chicago after what the faa is calling pressurization problem. this plane plummeted 28,000 feet in a mere three minutes time. we now know at least one passenger lost consciousness. joining me now with the very latest i have cnn s jean casarez and also mary schiavo, former inspector general for the u.s. transportation department. mary let me begin with you. pressurization problem. you described before the notion of falling that much a controlled fall three minutes like a roller coaster. what could explain this? well most typically when this happens and people will remember the plane stewart tragedy, it s a valve. there are valves on the plane that can keep the