Robert Sliwak was killed when the first plane struck the top floors of the north tower of the World Trade Center. Ryan Sliwak, the son of Robert Sliwak, shares more on his father’s legacy. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7 coverage