Boeing 777 crash lands at San Francisco International Airport

The interior of the Asiana Airlines Flight 214 that crashed at San Francisco International Airport in San Francisco, California is shown in this U.S. National Transportation Safety Board (NTSB) handout photo released on July 7, 2013. (Reuters/NTSB)

U.S. National Transportation Safety Board (NTSB) photo shows the wreckage of Asiana Airlines Flight 214 that crashed at San Francisco International Airport in San Francisco, California in this handout released on July 7, 2013. (Reuters/NTSB)

National Transportation Safety Board (NTSB) investigators conduct first site assessment of the wreckage of Asiana Airlines Flight 214, at San Francisco International Airport in San Francisco, California in this July 6, 2013 handout photo. (Reuters/NTSB)

Asiana Airlines Flight 214 skidding on the runway before crashing at San Francisco Airport on Saturday. (Arturas Rosenbacher)

This frame grab from video provided by KTVU shows smoke rising from an Asiana Airlines flight that crashed while landing at San Francisco Airport on Saturday, July 6, 2013. It was not immediately known whether there were any injuries. (AP Photo/KTVU) MANDATORY CREDIT (THE ASSOCIATED PRESS2013)

Smokes rises from Asiana Flight 214 after it crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) (THE ASSOCIATED PRESS2013)

This frame grab from video provided by KTVU shows the scene after an Asiana Airlines flight crashed while landing at San Francisco Airport on Saturday, July 6, 2013, in San Francisco. (AP Photo/KTVU) MANDATORY CREDIT

This aerial photo shows the crash site of Asiana Flight 214, right, at the San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Marcio Jose Sanchez) (THE ASSOCIATED PRESS2013)

Travelers look at the departures and arrivals board after Asiana Flight 214 crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. An Asiana Airlines flight from Seoul, South Korea, crashed while landing at San Francisco International Airport on Saturday, forcing passengers to jump down the emergency inflatable slides to safety. There were early reports of injuries, but the extent wasn't immediately clear. (AP Photo/Darryl Bush) (20122012)