"Gary Osoba" wrote in message
...
As such, I would suggest that when Paul MacCready’s team
achieved sustainable, controlled human-powered flight
by winning the Kremer Prize in 1977, the seminal flight
event in the past century had occurred.

I think that if you were to ask that question of 100 pilots, you would
get 100 legitimate, yet differing, answers; yours is as good as any. I
would counter-suggest that perhaps when the first aviator strapped on a
machine capable of actually carrying him to any one of thousands of
destinations with nearly 100% expectation of actually arriving, then the
seminal flight event in the past century had occurred. At a wild guess, I
would say that event happened perhaps 90 years ago.

Vaughn