An ex-BOAC Boeing 707 captain, since passed away, once told me that he'd warned his colleagues not to fly the 'Mt. Fuji tour' when the wind was from the direction it was on that fateful day. Before flying the 707, he'd earlier flown route proving flights to Tokyo in the Comet and had a healthy regard for the weather in that part of the world. He had a lifelong interest in meteorology, so his knowledge would have been better than that of most pilots.
Regrettably his advice was ignored.