A great way to break up the ennui of flying is to play around with aerial photography. Get yourself a window seat, a camera, and enjoy all the amazing landscapes Earth has to offer. I’ve recently been doing this more and more and I am loving it! Google Earth, step aside, Wolfe Earth is now a thing.
But seriously, you can get some great abstract shots and fancy yourself a spy from time to time. This last trip took me over the pole so I was able to get some images of ice break up in the Arctic Ocean north of Greenland, Russian farmlands, the east coast of the Caspian Sea, and the Alborz mountain range in Iran. While on the plane I do set my clock to local destination and try to get some sleep, but it can be very difficult, so I find this to be a very absorbing and intriguing distraction.