Rodrigo,
Yes, BTOD is becoming pretty standard on airlines… and it makes sense. Why pay for inferior screens in every seat when most every passenger has their own screen (or screens, I usually travel with phone, iPad, and laptop.)… then you only need to provide WiFi.
I’m happy to see you keeping up the frequency of you sketching! Keep at it! Draw through exercises like that chair are particularly good. Try putting a clean sheet over top and tracing it up with some clean line work.