I can’t believe 9/11 was 20 years ago. I still remember

I can’t believe 9/11 was 20 years ago. I still remember what I was doing and watching the 2nd plane hit the building on tv… I know 3 people that were all supposed to be in one of the buildings but lucked out that morning. I remember talking to a retired NYC police officer a couple years later that owned a gun shop in FL after telling me how the authorities all knew an attack was coming but they didn’t know how. He was working on a bridge and saw it all happen. The world was never the same after that.