Anyways for starters there's a certain small aircraft I call the delta flyer with a 20 ft wingspan that I've seen for at least 8 years now. I've seen this black 'aircraft' loitering around at low altitude that you'd think its a large bird and then within moments it gets up to speeds of over 900mph and cross miles of sky within 5 seconds. I've observed it at altitudes from 400ft to over 15,000 ft.
And there are many other instances; since I first observed it back in 1998 or earlier there are several other types I've cataloged.....
No trouble believing you at all.
I forget the areas in FL that are supposed to be hot beds of such sightings.
Will FREEPMAIL you shortly.