While investigators from both the U.S. and South Korea are in the early stages of an investigation that will include a weekslong examination of the wreckage and alcohol tests for the crew, the news confirmed what survivors and other witnesses had reported: a slow-moving airliner flying low to the ground.

"We are not talking about a few knots" difference between the aircraft's target landing speed of 137 knots, or 157 mph (250 kph), and how fast it was going as it came in for a landing, Hersman said.

Pilots normally try to land at the target speed, in this case 137 knots, plus an additional 5 more knots, said Bob Coffman, an American Airlines captain who has flown 777s. He said the briefing raises an important question: "Why was the plane going so slow?"

The airline said Monday in Seoul that the pilot at the controls had little experience flying that type of plane and was landing one for the first time at that airport.

Asiana spokeswoman Lee Hyomin said that Lee Gang-guk, who was at the controls, had nearly 10,000 hours flying other planes but only 43 in the 777, a plane she said he still was getting used to flying. Another pilot on the flight, Lee Jeong-min, had about 12,390 hours of flying experience, including 3,220 hours on the 777, according to the Ministry of Land, Infrastructure and Transport in South Korea. Lee was the deputy pilot, tasked with helping Lee Gang-guk get accustomed to the 777, according to Asiana Airlines.

Two other pilots were aboard, with teams rotating at the controls.

The plane's Pratt & Whitney engines were on idle and the pilots were flying under visual flight rules, Hersman said. Under visual flight procedures in the Boeing 777, a wide-body jet, the autopilot would typically have been turned off while the automatic throttle, which regulates speed, would have been on until the plane had descended to 500 feet (150 meters) in altitude, Coffman said. At that point, pilots would normally check their airspeed before switching off the autothrottle to continue a "hand fly" approach, he said.

There was no indication in the discussions between the pilots and the air traffic controllers that there were problems with the aircraft.

Survivors and rescuers said it was nothing less than astonishing that nearly everyone survived after a frightful scene of fire burning inside the fuselage, pieces of the aircraft scattered across the runway and people fleeing for their lives.

In the first comments on the crash by a crew member, cabin manager Lee Yoon-hye said that seconds before impact she felt that something was wrong.

"Right before touchdown, I felt like the plane was trying to take off. I was thinking 'what's happening?' and then I felt a bang," Lee told reporters Sunday night in San Francisco. "That bang felt harder than a normal landing. It was a very big shock. Afterward, there was another shock and the plane swayed to the right and to the left."

She said that during the evacuation, two inflatable slides that were supposed to inflate toward the outside instead inflated toward the inside of the plane, hurting two Asiana flight attendants. Pilots came to rescue the flight attendants but even after getting injured, she said that the crew did not leave the plane until after the passengers evacuated. She said she was the last one to go.

South Korea's Ministry of Land, Infrastructure and Transport said the 291 passengers included 141 Chinese, 77 South Koreans, 64 Americans, three Canadians, three Indians, one Japanese, one Vietnamese and one person from France.