The Asiana Airlines plane that crashed Saturday in San Francisco was flying at less than 160 kilometers per hour as it attempted to land, according to independent tracking data.
A National Transportation Safety Board official says the minimum recommended landing speed for the Boeing 777 is 253 kilometers per hour, 90 kilometers per hour more than the flight was tracked by Flightaware.com.
Two Chinese schoolgirls were killed and about 180 of the more than 300 people on board were injured when the Asiana plane clipped a seawall short of the runway and went skidding out of control, shredding the tail end of the plane and starting a fire.
The airline says the pilot of the was still in training to fly a Boeing 777 and was trying to land that type of aircraft at the San Francisco Airport site for the first time.
The flight data recorder also shows as the plane approached the runway, its pilots were warned the aircraft was likely to stall and were asked to abort the landing.
National Transportation Safety Board chair Deborah Hersman said Sunday the verbal "abort" request came just 1.5 seconds before impact, too late to avoid the crash that killed two people and injured dozens more.
Seconds earlier, she said, "engine stall" warnings sounded in the cockpit.
The two passengers killed were identified as 16-year-old Chinese girls who were among a group of 30 students and their teachers headed to a summer camp from east China's Zhejiang province.
The flight originated in Shanghai and stopped in South Korea before heading to San Francisco .