I had it on UA837, SFO-NRT, about 1 week ago. When I was boarding, the captain was in the front galley giving a briefing to the flight attendants and I overheard them talking about this. A passenger had requested it, and the captain said he would turn it on, and he made some comment about how he's happy to turn it on but he is surprised that anyone cares about this. i probably should have gone over and told him I care about it, but at the time I didn't feel like interrupting them and speaking up.