But DVDs last forever, Olympus, and YouTube entries can get deleted. Especially when YouTube is notified by the indignant person who tracked down a good colour copy of the film (there was a version in B&W), bought the rights, scanned it carefully and put the DVD together...
I bought the DVD and I'm keeping it. Together with many other aviation people of a certain vintage, I had been hoping to see this film again. Especially as one of the aircraft in it features in my logbook (1966).
The people who made the DVD (and they have other rare aviation films available too, I think), deserve some support.