SAN FRANCISCO (NBC News) -- Investigators are planning to interview the pilots controlling the Asiana flight that crashed at San Francisco's International Airport Saturday.
They know the flight was traveling significantly below its target speed, now the question is why and what was done to correct the problem.
Investigators are sifting through what remains of the Boeing triple-7 today looking for clues among the mangled seats and dangling air masks.
They're trying to determine if pilot experience played a role in the fatal crash or if an equipment malfunction could be to blame.
A black box recording retrieved from the flight indicates low speed contributed to the crash.
"The approach speech was 137 knots. i will tell you the speed was significantly below 137 knots and we're not talking about a few knots," says NTSB Chairman Debbie Hersman.
Investigators say the first time crews verbally noted a problem on that recording was just seven seconds before the crash.
Moments later the crew unsuccessfully tried to increase speed and abort the landing.
Now investigators are trying to determine if the pilot's experience played a role.
South Korea's transportation ministry says one pilot was in training and had less than 50 hours experience on the triple-7.
Authorities are investigating whether an emergency vehicle ran over one of the two teen girls killed in the crash.
The girls' parents are arriving in San Francisco from China today.
Investigators say it is going to take weeks to finish this investigation.
Those who saw the crash and the wreckage say its miracle more people weren't killed.
-- Danielle Leigh, NBC News, reports