A passenger plane in South Korea crashed on Dec. 29, killing nearly all of the 181 people on board, in one of the deadliest aviation disasters in recent years. The U.S. National Transportation Safety Board said it was leading a team of American investigators—including representatives from the U.S. Federal Aviation Administration and Boeing —to assist South Korea’s officials in their probe. The Boeing 737-800 suffered an apparent bird strike as it approached Muan International Airport, attempted to land at a high rate of speed without its landing gear down, slid off the runway and slammed into a concrete barrier.