Tim Lilley, the father of Sam Lilley, discusses his son's legacy following the fatal midair collision between a passenger jet and a U.S. Army helicopter near Ronald Reagan Washington National Airport. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G Watch 24/7 coverage of breaking news and live events on ABC News Live: https://www.youtube.com/watch?v=gN0PZCe-kwQ&ab_channel=ABCNews Watch full episodes of World News Tonight with David Muir here: https://youtube.com/