Motionless small bright white dot in noontime sky northwest of Plano, Texas (DFW) sky vanished in an instant.

This was a sighting that I experienced back in 1991, and although 26 years have passed, I thought I would document my experience here for the record.  
On or about May 31, 1991, I was sitting in a recliner in my back yard by the pool.  The time was approximately 11:00 a.m.  
Out of the corner of my eye I saw a bright small white dot in the northwest area of the sky.  I stared at this object for several minutes and it seemed to be at a very high altitude and just stood there motionless.  
After staring at the object, I noticed a strange feeling as though they were surveying the entire Dallas/Fort Worth metroplex.  I also had a strange feeling as though they knew I was watching them.  It is hard to describe, but it seems there was some kind of telepathic presence.  It made me feel slightly uneasy.  
After watching the object for approximately another five minutes, this bright small dot of an object just "popped" out of view.  One second it was there, the next, it was gone.  I happened in an instant.  
Although the motionless standing there was unusual, the real unusual thing was the feeling that I experienced of our entire metroplex being under surveillance and my feeling that whatever it was knew I (and whomever else witnessed it) was watching.
Witness indicates that the date of the sighting is approximate.  PD