The only planes we heard were military planes, We live on the CA border and have a Navel Air Base just South West of us.
It was spooky to see them fly the coast and border in the day light. They were out in force.
It did make me feel a bit safer but was uncertain of what was going to happen in the days to come.
Another strange thing I remember. I drove to town latter that day to do something and it was unusually quiet, not much traffic the mall was almost empty. Made for a uneasy feeling that I could not shake.
Although I was mesmerized by the television coverage for days as was everyone else the one image that is imprinted on my mind, and had the most impact on me seems trite and insignificant to most others.
1, 2, or 3 days after the attack the TV networks broadcast a photograph taken from inside Air Force One showing a F-16 flying just off the port wing.
When I first saw that photograph I was absolutely stunned. In over 3 years of flying on Air Force One it was always a tremendous point of pride that we never traveled with any type of visible escorts. Seeing that fighter flying cover brought home the reality that something really, really bad was happening and what we had once considered normalcy was probably gone forever.
Jack
She snores almost as loud as I do. 
All goodness bless the fallen and the survivors.
kissies to Oski