MostlyModerate, imho Browright has got a point....
I've had occasion to point out to the Cabin Crew were I work that the apparent rudeness exhibited by some of our African passengers, e.g not saying "please" & "thank you" and / or maybe 'hissing' when trying to attract attention rather than saying "excuse me", is simply because in their local culture such behaviour is considered entirely normal.
And there's certainly precedent to employ locals, and it seems to work quite well, e.g. Ghana International Airlines use Ghanaian locals as Cabin Crew, whilst the aircraft & pilots (and some senior CC) are from Ryan International (i.e. American). Similarly, when Astraeus was providing a 'damp lease' to 'Iceland Express' we had Icelandic Cabin Crew and I suspect that Astraeus will likewise employ locals with its forthcoming Nigeria contract.