I guess UA would be embarrassed of pictures of their video screens in Y on a 747!

I always take pictures of the map (personal video screens). My recent trip on a 787 from NRT-DEN I was sitting in a mostly empty rear BF cabin taking numerous pictures of the wing/engine at sunrise. The FA even took an interest in the pictures I was taking but said nothing about the prohibition against taking pictures and I would imagine the wing/engine would fall under their rules of things I can't take a picture of.