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 & I were watching an airliner flying North.
Then, 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.