While at a swimming hole, we saw a bright light zoom up to an airliner, fly alongside it for a time, then zoom off again.

My friend and I were lying on the grass next to a swimming hole in the woods. A number of our friends were there too. He and I were watching an airliner flying north. Suddenly a bright, circular light zoomed up from the southeast, flew alongside of the airliner for a while, then zoomed off to the northeast. Its speed made the airliner look like it was standing still. Earlier that summer my friend's mom had lent me a recently published book claiming the existence UFOs. I had never heard of them before, but perhaps this was one of them.