I work right next to Orlando airport. I remember pulling into the parking lot right as the news reported the first plane hit. Thinking the news was (once again) getting it wrong over plane type and size, I went inside thinking it was a private plane such as a Cessna that had done it. Listening to the radio inside I kept thinking this until the 2d-plane hit. Immediately I knew it was a terrorist attack.
The thing that sticks out to me of that day and the days following were no aircraft coming in or out of OIA. It was almost eerie.
The no aircraft in the skies was very very odd. It was so quiet. I was walking into my sisters house when I heard the first plane after all that silence. I actually let out a scream! Scared the heck out of me, I thought we were being attacked, again.