bright white lightLike 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.