OMGoodness! That’s really neat! You were lucky to see it twice. Sigh...
There’s also the rainbow around the shadow of the plane on the clouds that you can see if the sun is in just the right place.
And the small planes flying “sideways” and sometimes “backward” if you’re on a jet and stare downward out the window at the ground for the whole trip, LOL!
I used to fly back and forth between southern and northern California for a while when Hubby got a job up north.
I notice that sometimes when you see jets flying through the sky you can see the shadow of the aircraft ahead of its trail. Certainly the lighting has everything to do with it. It’s always amazing to see.