Market enviornments change though. There's probably a lot more people with disposable income in the higher end and plane travel has exploded since then. But gov

Market enviornments change though. There's probably a lot more people with disposable income in the higher end and plane travel has exploded since then. But gov controls and red tape on this sort of thing probably tripled, especially around environment/airport development+nimby politics/aircraft regulations, so it's probably 50/50 vs the 1970s-80s.