U.S. National Transportation Safety Board (NTSB) photo shows Asiana Airlines Flight 214 at San Francisco International Airport in San Francisco, California released on July 7, 2013. The Asiana Airlines Boeing 777 that crashed at San Francisco's airport on Saturday was traveling "significantly below" its intended speed and its crew tried to abort the landing just seconds before it hit the seawall in front of the runway, the U.S. National Transportation Safety Board said on Sunday.