Somewhat related to your points, I found that a lie-flat bed is highly beneficial for long haul flights, such as US <-> Asia, especially as you get older and yo

Somewhat related to your points, I found that a lie-flat bed is highly beneficial for long haul flights, such as US <-> Asia, especially as you get older and your body can't take the punishment of sitting in economy for 13 hours. I would lose a day upon landing when flying economy from being too exhausted and needing to crash, which was greatly mitigated by getting a good sleep lying down. Lie-flat beds are available in business class, so it's much less cost prohibitive.