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Asiana Airlines flight 214 crew members take part in a press conference at the San Francisco International Airport on Wednesday, July 10, 2013 in San Francisco, Calif. (Aric Crabb/Bay Area News Group) ( ASIANA AIRLINES FLIGHT 214 CRASH FOLLOW )

An Asiana Airlines flight 214 crew member reacats during a press conference at the San Francisco International Airport on Wednesday, July 10, 2013 in San Francisco, Calif. (Aric Crabb/Bay Area News Group) ( ASIANA AIRLINES FLIGHT 214 CRASH FOLLOW )

Three charter buses, reportedly caring passengers from Asiana Airlines Flight 214 pull away after visiting the crash site at San Francisco International Airport, in South San Francisco, Calif., on Wednesday, July 10, 2013. The Boeing 777 plane operated by a Korean airline crashed as it was landing at SFO on Saturday, July 6 killing two and injuring close to 200 passengers. (Anda Chu/Bay Area News Group) ( National Transportation Safety Board briefing Asiana Airlines Fl )

Survivors of Saturday's Asiana Airlines Flight 214 crash and others visit the site at San Francisco International Airport on Wednesday night, July 10, 2013. The parents and relatives of the two 16-year-old girls who were killed reportedly were present. (KGO-TV)

National Transportation Safety Board Chairwoman Deborah Hersman conducts a briefing on the Asiana Airlines Flight 214 crash investigation as a photo of the plane is projected onto a screen, from a hotel near the San Francisco International Airport, in South San Francisco, Calif., on Wednesday, July 10, 2013. The Boeing 777 plane operated by a Korean airline crashed as it was landing at SFO on Saturday, July 6 killing two and injuring close to 200 passengers. (Anda Chu/Bay Area News Group) ( National Transportation Safety Board briefing Asiana Airlines Fl )

National Transportation Safety Board Chairwoman Deborah Hersman conducts a briefing on the Asiana Airlines Flight 214 crash investigation as a slide of communications between the air traffic control tower and the flight crew is projected onto a screen, in South San Francisco, Calif., on Wednesday, July 10, 2013. The Boeing 777 plane operated by a Korean airline crashed as it was landing at SFO on Saturday, July 6, killing two and injuring close to 200 passengers. (Anda Chu/Bay Area News Group) ( National Transportation Safety Board briefing Asiana Airlines Fl )

Workers collect and bag items near a runway at San Francisco International Airport on Wednesday, July 10, 2013, in San Francisco, Calif. (Aric Crabb/Bay Area News Group) ( ASIANA AIRLINES FLIGHT 214 CRASH FOLLOW )

Asiana Airlines Flight 214 lands next the the wreckage of its sister plane at the San Francisco International Airport on Wednesday, July 10, 2013, in San Francisco, Calif. The Boeing 777 plane crashed Saturday as it was landing at the airport, killing two passengers and injuring close to 200. (Aric Crabb/Bay Area News Group) ( ASIANA AIRLINES FLIGHT 214 CRASH FOLLOW )

An injured South Korean passenger, second from right, who was aboard Asiana Airlines Flight 214 when it crashed while landing at San Francisco International Airport on Saturday, is moved to a stretcher upon his arrival at the Incheon Airport in Incheon, South Korea, Wednesday, July 10, 2013. Investigators are trying to understand whether automated cockpit equipment Asiana flight 214's pilots say they were relying on to control the airliner's speed may have contributed to the plane's dangerously low and slow approach just before it crashed. (AP Photo/Ahn Young-joon) ( South Korea US San Francisco Airliner Crash )