National Transportation Safety Board Chairwoman Jennifer Hommendy described the investigation into the crash Wednesday night as an “all-hands-on-deck event” for the agency during a news conference Thursday in which she appeared with members of the board and a senior investigator overseeing the probe.

Ryan O'Hara, 29, was the crew chief of the Black Hawk helicopter that collided with the passenger plane, according to CBS News. He leaves behind a wife and one-year-old son, his local Reserve Officers' Training Corps (ROTC) program said in a social media post confirming his death.