bright white light

Like many nights, I'm watching the sky.  I noticed something out of the corner of my eye, and when I turned to look, I saw a very bright light and it went out.  It came on again within 2 seconds.  I didn't think much of it since it was in a high flight path for airlines.  
In between the light flashes, the object didn't move much more the a passenger plane would have moved, it flashed one more time and I never saw any lights again, it just disappeared.  
I noticed there were no other navigation lights.  No red or green nor a flashing white. this flight path was west to east and would have to be 10 to 30 thousand feet.  No contrail was observed.  No sound heard.
I would describe the light as very bright like a helicopter landing light.  The light was to my south and between 75 to 80 degrees, almost overhead.
Within about 1 minute there was a plane making an east to west pass almost on a reciprocal course and altitude, all lights were visible, you could hear it, there was no comparison between the two.
I spent 2 years active duty in the navy.  I was trained in lookout techniques, and was a radar operator in the combat information center for most of my service.