National Transportation Safety Board (NTSB) member Robert L. Sumwalt listens to a question during a news conference regarding the NTSB's 2013 "Most Wanted List" of transportation challenges, Wednesday, Nov. 14, 2012, at the National Press Club in Washington. (AP Photo/Charles Dharapak)

Associated Press
National Transportation Safety Board (NTSB) member Robert L. Sumwalt listens to a question during a news conference regarding the NTSB's 2013 "Most Wanted List" of transportation challenges, Wednesday, Nov. 14, 2012, at the National Press Club in Washington. (AP Photo/Charles Dharapak)
National Transportation Safety Board (NTSB) member Robert L. Sumwalt listens to a question during a news conference regarding the NTSB's 2013 "Most Wanted List" of transportation challenges, Wednesday, Nov. 14, 2012, at the National Press Club in Washington. (AP Photo/Charles Dharapak)
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