The National Transportation Safety Board (NTSB) has released information from the investigation into the circumstances of the second-worst airline disaster in U.S. history that sheds new light onto its causes. American Airlines Flight 587 crashed into a residential suburb of New York City shortly after takeoff from John F. Kennedy Intl. Airport on November 12, 2001. Flight 587 was operated on an Airbus A300-605R, a variant of the A300-600 series aircraft, the second most popular model of commercial aircraft behind Boeing's 757. According to the NTSB, a design flaw in the rudder of Airbus A300-600 series aircraft makes the rudder pedals extremely sensitive at high speeds. Pilots who are unaware of this sensitivity and apply too much force can unintentionally cause the rudder panel on the jet's tail to rock violently back and forth, which, according to the NTSB's analysis, can create enough force to break a jet apart midair. A rudder is a movable panel on the fin that rises from the tail of a jet, and it is designed to keep a jet pointed straight in a cross wind or while flying on one engine.