Going North

I debated whether to straighten this shot but decided against it when i looked again at the going South shots. Not exactly sure of the reason of the opposite slant but maybe it is just because the plane is at an angle?? I thought they flew flat. Any physicist out there that knows why I would love to know too! I had tried to ge the horizon level! Magic sunset!
I have fun in London today and the highlight was the Paul Klee exhibition at Tate Modern, so so interesting.