Hersman, Chairman of National Transportation Safety Board (NTSB) speaks, as San Francisco Mayor Lee stands beside, during a news conference at San Francisco International Airport

 
Hersman, Chairman of National Transportation Safety Board (NTSB) speaks, as San Francisco Mayor Lee stands beside, during a news conference at San Francisco International Airport
Deborah Hersman, Chairman of National Transportation Safety Board (NTSB) speaks as San Francisco Mayor Ed Lee stands beside, during a news conference at San Francisco International Airport July 7, 2013. REUTERS/Stephen Lam