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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) ( APTOPIX San Francisco Airliner Crash )

Passengers evacuate the Asiana Airlines Boeing 777 aircraft after a crash landing at San Francisco International Airport in California on July 6, 2013 in this photo provided by passenger Eugene Anthony Rah released to Reuters on July 8, 2013. REUTERS/Eugene Anthony Rah/Handout via Reuters ( USA-CRASH/ASIANA )

Asiana Airlines Boeing 777 is engulfed in smoke on the tarmac after crash landing at San Francisco International Airport in California on July 6, 2013 in this photo provided by passenger Eugene Anthony Rah released to Reuters on July 8, 2013. REUTERS/Eugene Anthony Rah/Handout via Reuters ( USA-CRASH/ASIANA )

Asiana Airlines Boeing 777 is engulfed on the tarmac after crash landing at San Francisco International Airport in San Francisco, California on July 6, 2013 in this photo courtesy of passenger Eugene Anthony Rah released to Reuters on July 8, 2013. REUTERS/Eugene Anthony Rah/Handout via Reuters ( USA-CRASH/ASIANA )

Evacuated passengers are seen on the tarmac as firefighting trucks spray water on Asiana Airlines flight 214 as it sits on the runway burning at San Francisco International Airport in this July 6, 2013 picture taken by a passenger of the plane. The Asiana Airlines Boeing 777 with 307 people on board crashed and burst into flames as it landed at San Francisco International Airport after a flight from Seoul, killing two people and injuring more than 180. The two dead were both teenage female Chinese nationals who had been seated at the rear of the aircraft, according to government officials in Seoul and Asiana. REUTERS/Xu Da ( USA-CRASH/ASIANA )

A Boeing 777 airplane lies burned near the runway after it crash-landed at San Francisco International Airport July 6, 2013 in San Francisco, California. An Asiana Airlines passenger aircraft coming from Seoul, South Korea crashed while landing, killing two people and injuring scores of others. (Photo by Ezra Shaw/Getty Images) ( 173091652 )

An aerial view of an Asiana Airlines Boeing 777 plane is seen after it crashed while landing at San Francisco International Airport in California on July 6, 2013. Two people were killed and 130 were hospitalized after the plane crash-landed at San Francisco International Airport on Saturday morning, San Francisco Fire Department Chief Joanna Hayes-White said. REUTERS/Jed Jacobsohn ( USA-CRASH/ASIANA )

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) ( San Francisco Airliner Crash )

The San Francisco skyline is seen in the background as an Asiana Airlines Boeing 777 plane lies off the runway after it crashed while landing at San Francisco International Airport in California on July 6, 2013. The Asiana Airlines Boeing 777, with 307 people on board, crashed and burst into flames as it landed at San Francisco International Airport on Saturday after a flight from Seoul, killing two people and sending more than 180 to local hospitals. REUTERS/Jed Jacobsohn ( USA-CRASH/ASIANA )

An Asiana Airlines Boeing 777 is seen on the runway at San Francisco International Airport after crash landing on July 6, 2013. Video footage showed the jet, Flight 214 from Seoul, on its belly surrounded by firefighters. Josh Edelson/AFP/Getty Images ( 521186191 )

People watch a news program reporting about Asiana Airlines flight 214 which took off from Seoul and crashed while landing at San Francisco International Airport, at Seoul Railway Station in Seoul, South Korea, Sunday, July 7, 2013. The writing on the screen reads " Fire on the ceiling of the airplane." (AP Photo/Ahn Young-joon) ( South Korea US San Francisco Airliner Crash )

Firefighters spray water on Asiana Airlines flight 214 as it sits on the runway burning at San Francisco Airport International Airport in this July 6, 2013 handout from the United States Coast Guard Southwest. The plane, with 307 people on board, crashed and burst into flames as it landed at San Francisco International Airport on Saturday after a flight from Seoul, and initial reports said two people were killed and more than 130 sent to hospitals. REUTERS/Air Station San Francisco/United States Coast Guard Southwest/Handout via Reuters ( USA-CRASH/ASIANA )

A YouTube video grab shows an Asiana Airlines Boeing 777 aircraft after it crashed while landing at San Francisco International Airport in California, July 6, 2013. An Asiana Airlines Boeing 777 flying from Seoul crashed while landing on Saturday at San Francisco International Airport, the U.S. Federal Aviation Administration said. FAA spokesman Lynn Lunsford said it was flight No. 214, and she said it was unclear how many people were on board. REUTERS/@360KID Scott Traylor/Handout via Reuters ( USA-CRASH/ASIANA )

Passengers wait near a ticket counter at San Francisco International Airport after an Asiana Airlines Boeing 777 crash landed on the runway at San Francisco International Airport on Saturday, July, 06, 2013. At least two people were killed and 130 injured when an Asiana Airlines Boeing 777 jet crashed and caught fire as it landed short of the runway. AFP PHOTO/JOSH EDELSON ( 521190454 )

Passengers wait for their delayed flight to London with British Airways after an Asiana Airlines Boeing 777 crashed and burst into flames as it landed at San Francisco International Airport in San Francisco, California July 6, 2013. REUTERS/Jana Asenbrennerova ( USA-CRASH/ASIANA )

Passengers wait for their delayed flights after an Asiana Airlines Boeing 777 crashed and burst into flames as it landed at San Francisco International Airport in San Francisco, California July 6, 2013. REUTERS/Jana Asenbrennerova ( USA-CRASH/ASIANA )

Investigators comb the end of a San Francisco International Airport runway following the crash of Asiana Flight 214 on Saturday, July 6, 2013, in San Francisco. (AP Photo/Noah Berger) ( San Francisco Airliner Crash )

Debris from an Asiana Airlines Boeing 777 plane is seen on a runway after it crashed while landing at San Francisco International Airport in California on July 6, 2013. Two people were killed and 130 were hospitalized after the plane crash-landed at San Francisco International Airport on Saturday morning, San Francisco Fire Department Chief Joanna Hayes-White said. The figures cited by Hayes-White leave 69 people still unaccounted for in the accident. The Boeing 777, which had flown from Seoul, South Korea, was carrying 307 people. REUTERS/Jed Jacobsohn ( USA-CRASH/ASIANA )

Rescue officials stand near an Asiana Airlines Boeing 777 plane after it crashed while landing at San Francisco International Airport in California on July 6, 2013. Two people were killed and 130 were hospitalized after the plane crash-landed at San Francisco International Airport on Saturday morning, San Francisco Fire Department Chief Joanna Hayes-White said. The Boeing 777, which had flown from Seoul, South Korea, was carrying 307 people. REUTERS/Jed Jacobsohn ( USA-CRASH/ASIANA )

The detached tail and landing gear of Asiana Flight 214 rest on the tarmac after the plane crashed at San Francisco International Airport on Saturday, July 6, 2013, in San Francisco. (AP Photo/Noah Berger) ( San Francisco Airliner Crash )

Passengers from Asiana Flight 214 are treated at San Francisco General Hospital after the plane crashed at San Francisco International Airport in San Francisco, Saturday, July 6, 2013. (AP Photo/Bay Area News Group, John Green) ( San Francisco Airliner Crash )

Veddpal Singh, a passenger from the crashed Asiana Airlines Boeing 777, speaks to the members of the press after an Asiana Airlines flight 214 crashed and burst into flames as it landed at San Francisco International Airport in San Francisco, California July 6, 2013. Veddpal sat in the middle part of the plane and suffered a fractured collar bone. REUTERS/Jana Asenbrennerova ( USA-CRASH/ASIANA )

A passenger from the crashed Asiana Airlines Boeing 777 that flew from Seoul talks to the press at San Francisco International Airport in San Francisco, California July 6, 2013 before being interrupted by the police and escorted to a waiting room designated for families and friends of passengers. Asiana Airlines Flight 214 crashed while landing on Saturday at San Francisco International Airport, the U.S. Federal Aviation Administration said. REUTERS/Jana Asenbrennerova ( USA-CRASH/ASIANA )

Parents of Wang Linjia, center, are comforted by parents of some other students who were on the Asiana Airlines Flight 214 that crashed at San Francisco International Airport, at Jiangshan Middle School in Jiangshan city, in eastern China's Zhejiang province, Sunday July 7, 2013. Chinese state media have identified the two people who died in the plane crash at San Francisco International Airport on Saturday as Ye Mengyuan and Wang Linjia, students at Jiangshan Middle School in China's eastern Zhejiang province. (AP Photo) ( APTOPIX China US San Francisco Airliner Crash )

A woman (C), believed to be the mother of a victim of an Asiana Airlines aircraft crash in San Francisco, is surrounded by members of the media in the lobby of the company's headquarters in Seoul on July 7, 2013. At least two people were killed and 130 injured when an Asiana Airlines Boeing 777 jet crashed and caught fire as it landed short of the runway at San Francisco International Airport. Ed Jones/AFP/Getty Images ( 521190067 )

Yoon Young-doo (C), President of the Asiana Airline, leaves after a news conference at its head office in Seoul July 7, 2013. Asiana Airlines does not believe that the fatal crash of one of its Boeing 777 planes in San Francisco on Saturday was caused by mechanical failure, although it refused to be drawn on whether the fault lay with pilot error. REUTERS/Kim Hong-Ji ( USA-CRASH/ASIANA )

National Transportation Safety Board (NTSB) Chairwoman Deborah Hersman speaks to members of the media prior to her departure with an NTSB "go-team" for San Francisco to investigate the crash of Asiana Airlines Flight 214 July 6, 2013 at Reagan National Airport in Arlington, Virginia. A Boeing 777 operated by Asiana Airlines crashed as it was landing at San Francisco International Airport. (Photo by Alex Wong/Getty Images) ( 173082303 )

In this photo provided by the National Transportation Security Board (NTSB), NTSB investigators conduct a first site assessment overnight of the Asiana Airlines flight 214 that crashed at the San Francisco International Airport in San Francisco, Saturday, July 6, 2013. The Asiana Airlines Boeing 777 crashed while landing after a 10-hour-plus flight from Seoul, South Korea. The flight originated in Shanghai and stopped in Seoul before the long trek to San Francisco. (AP Photo/NTSB) ( San Francisco Airliner Crash )

Air travelers sleep on the bench in the international terminal at San Francisco International Airport July 7, 2013. Air travel continues to be heavily congested the day after Asiana Airlines flight 214 with 307 people on board crashed and burst into flames as it lands on the runway after a flight from Seoul, killing two people and sending more than 180 to local hospitals. REUTERS/Stephen Lam ( USA-CRASH/ASIANA )

Travelers wait in long lines to speak with airline ticket agents in the United terminal at San Francisco International Airport on July 7, 2013 in San Francisco, California. A day after Asiana Airlines flight 214 crashed upon landing at San Francisco International Airport, stranded travelers are experiencing long lines and cancelled flights as the airport continues to operate with only two runways for departures and arrivals. Two people died and dozens were injured in the crash that shut down the airport for several hours and resulted in dozens of flights being cancelled. (Photo by Justin Sullivan/Getty Images) ( 173109135 )

A traveler speaks to an airline ticket agent in the international terminal at San Francisco International Airport on July 7, 2013 in San Francisco, California. A day after Asiana Airlines flight 214 crashed upon landing at San Francisco International Airport, stranded travelers are experiencing long lines and cancelled flights as the airport continues to operate with only two runways for departures and arrivals. Two people died and dozens were injured in the crash that shut down the airport for several hours and resulted in dozens of flights being cancelled. (Photo by Justin Sullivan/Getty Images) ( 173109143 )

San Francisco International Airport public information officer Doug Yakel (C) speaks with NTSB agents in the international terminal at San Francisco International Airport on July 7, 2013 in San Francisco, California. A day after Asiana Airlines flight 214 crashed upon landing at San Francisco International Airport, stranded travelers are experiencing long lines and cancelled flights as the airport continues to operate with only two runways for departures and arrivals. Two people died and dozens were injured in the crash that shut down the airport for several hours and resulted in dozens of flights being cancelled. (Photo by Justin Sullivan/Getty Images) ( 173109141 )

This image released by the National Transportation Safety Board Sunday, July 7, 2013, shows the flight data recorder, left, and the cockpit voice recorder from the Boeing 777 Asiana Airlines Flight 214, at the recorders laboratory at the NTSB's Washington headquarters in Washington. The Asiana flight crashed upon landing Saturday, July 6, at San Francisco International Airport, and investigators took the flight recorders to the recorders laboratory at the NTSB's Washington headquarters overnight to begin examining its contents for clues to the last moments of the flight, officials said. (AP Photo/NTSB) ( San Francisco Airline Crash )

NTSB aerospace engineer Greg Smith with the flight data recorder, left foreground, and the cockpit voice recorder, closest to his hand, from the Boeing 777 Asiana Airlines Flight 214, at the recorders laboratory at the NTSB's Washington headquarters. The Asiana flight crashed upon landing Saturday, July 6, at San Francisco International Airport, and two of the 307 passengers aboard were killed. (AP Photo/NTSB) ( Sand Francisco Airline Crash )