The in air 1-26 footage seems to be from the short film "Dawn Flight" It's available at Cumulus Soaring and the making of it was covered in Soaring magazine. I recall seeing more of that film being used in at least one other Six Million Dollar Man episode too.

Anyone else out there who was a kid in the 70's remember having the same reaction to the Six Million Dollar Man opening that I did? You know, the one that shows a terrible crash and (in the show's universe if not in reality) the guy only survives because of the availability of expensive experimental technology to rebuild him... whenever I saw it it always left me thinking: "Man... I wanna be a pilot! That would be SO COOL!"