They 'll be joined by a `` go-to '' team from the United States ' National Transportation Safety Board , led by chairman Deborah Hersman . `` It could have been much worse , '' San Francisco 's mayor says . Asiana Airlines ' Flight 214 was arriving from Seoul when it crashed . The pilot and co-pilot were killed in the crash. Everyone who had been on the plane is now accounted for .
`` It could have been much worse , '' San Francisco 's mayor says . Asiana Airlines ' Flight 214 was arriving from Seoul when it crashed . The pilot and co-pilot were killed in the crash. Everyone who had been on the plane is now accounted for .