A sonic boom on 9/11 - we live in an air force town, always lots of noise from the military planes, but never in my life heard one take off so fast that it caused a sonic boom. Everyone was already so confused and terrified that day. When we heard the boom, my family ran outside to look at the sky, unsure what happened and I (17 y/o) just freaking lost it. For a moment it felt like the end of the world.