Yeah I'd seen that one, but I'm fairly sure that is a later addition (and not an airstrip) as it only appeared between the 2015 & 2016 image.
I think you are right that this may be one that is now lost to the mists of time - it was 55 years ago.
I visited Zanzibar in 1991, and it looks to have changed hugely since then. I knew that there had been a revolution in Zanzibar in the early 1960s but I hadn't realised quite how violent it was. The whole film is a bit of an eye opener, and I thought that I was quite knowledgeable about the end of colonialism in Africa.
Any thoughts of the aircraft registration? I'd assume Tanganyika as the film says that they were hired from the mainland.
There is another airfield at 01:47:48
I think it is Elizabethville/Lubumbashi, but not 100% on this.
I'm happy to pass control back to Flap40 - I'll keep on looking around for info about it and post up if I can find anything.