Thanks Eric and Ron for your comments. I'm really happy with this composition too!
The ghosting in the upper right is in fact a reflection on the plexiglass I'm shooting through. I thought about trying to deal with it, but to be honest I try to not spend so much time in post anymore. In the past, I haven't been that successful with the reflections. Maybe I'll play with it.
But it's easy to give the square format a try as you suggested:
Just for fun, here is the original, as I saw it from the plane:
Between the haze and the plexiglass, the untouched colors in the image were not too exciting.