by kleinbl00

As we looked for traffic, we noticed what appeared to be a translucent, milky white wall moving from the left, over the USSR, to the right, toward the Northern Pacific Ocean. It covered the entire sky from ground level to as far up as we could see looking out the front windows of the airplane. It moved very quickly—far faster than crossing airplane traffic—and rapidly approached us. The wall of light passed across our flight path and then continued eastward, leaving the empty and dark night sky in its wake. Our programmed turn time arrived and we began our bank to the left to collect on the RVs. Once we rolled out southbound the wall of light was no longer visible to the east.