Earlier quoted context omitted.
Flights were five times more expensive in the period you refer to [1]. I would bet that the number of fliers increased almost proportionally. A significant part of this cost reduction is efficiency gains, with better, lighter airplanes that consume less fuel. Airplanes are also safer today. To call all that "no appreciable movement" is unfair. [1] https://www.fastcompany.com/3022215/what-it-was-really-like-...
Noted, FYI: https://news.ycombinator.com/item?id=31500807
> Gordon's point is that the best commercial-grade service ... didn't move much in the seventy-eight years* from 1936--2014. It's been nearly another decade and that story's largely the same.
The fact that total passenger miles has been largely flat since 2000 (is that even accurate? [1]) has no bearing on that claim. Furthermore, the number of passengers has basically tripled in the last 20 years alone [2], at the cost of some comfort certainly, but this also must count as efficiency gains. I mean, if we ignore an order of magnitude reduction in cost and increase in number of passengers, yeah, I guess the industry is the same since the Wright Brothers.
[1] https://www.statista.com/statistics/185744/us-passenger-mile... [2] https://www.statista.com/statistics/564717/airline-industry-...