Us retired folk who travel don't have the bodies we once had that could tolerate hours on end in cattle class. So J is the way. At the moment, the peak of the Baby Boom is now 65yrs old on average. How long that cohort continues to travel before they get "too old" is something I don't know, but figure another 5 years of peak retiree travel, then tapering off again?

How does one plan the fleet to cope. That's AC's question.