Lighted up as passenger jet was flying past it

I had walked outside to lock up my truck when I had the feeling to look up. I was watching a jet flying west to East when suddenly what looked like electricity flickering, moving up and down,from right to left then spiked up around 500ft came down and continued to the left when suddenly a large circle of light came on. The jet was flying even with the bottom of the circle and around the center of it. The bottom of the circle was 4 times the length of the jet. I could see the light through the windows on the jet and the outline of it. The jet was about 50ft from the circle and as it passed the edge of the circle the light went out. My guess is that the jet was around 30,000ft and the circle was 2,000ft across. The sky was clear that night but I saw nothing before or after in the sky.