Yes, but come on. 1967. We surely have made a lot of progress since then. 50 years of holding back is a bit much. Are we going to still hear "but retraining is soooooo difficult" in 2067?
retraining isn't difficult but retraining is expensive.
Southwest, Ryanair and their competition are literally nickel and diming everything to offer ever cheaper seats to fliers. Until that changes, airlines will balk at new aircraft.
It's why 737Max was developed instead of NMA; Airbus came out with the 320 and 330neo series, which did not require retraining.
