I saw this on Bloomberg and was thinking back to the late 1970's when I was doing some traveling. I think the longest flight I did back then was a trip to Kenya, but it wasn't non-stop. It was just long taken as a whole. St. Lewis to NY, NY to Geneva, a third stop I don't remember, and finally Nairobi.
I think the longest non-stop I did was NY to Thailand back in 2007. Something like 12 hours or so. Flew over the N pole.
I did see a video, probably on Youtube - It was a guy who was doing some articles on long flights on expensive airlines. I forget the airlines, but it was something like Qatar to Amsterdam. He had a room with a door and all the amenities you could ask for including room service, recliner/bed, TV, etc., etc. Ah, to be rich...