Ever since I took an atmospheric science class I've come to love the view even when we're above the clouds. I try to identify cloud formations and guess whether it might be raining/snowing below. Seeing a big ol' cumulonimbus from that vantage point is cool as hell.

Also, seeing the wing control surfaces moving.

Me on my flight from Seoul to Stockholm: "oh look, grassy plains. I must be over Russia!"
13 hours later: "oh would you look at that, more grassy plains, still over Russia 😒" Flying over Russia is like flying over the ocean except it's grass.

Agree. Ocean flights are boring as well.

If only my neck wouldn't hurt so much after staring

I really enjoy watching the features of the desert when I fly to Vegas. You can almost see the geographic history of how the grand canyon came about. I love the dried up river beds that look like ancient crooked highways.

On night flights there's mysterious patterns of lights on the ground. What town is this, is that a stadium? Why is there one solitary light in the middle of nowhere? Why are the streetlights yellowish over there and pinkish over there?

Passing over mountains is the best!

Or the water... the endless water, when you fly over the Atlantic ;)