We took a military plane from Cabinda to Luanda last year. On arrival in Luanda you just drive out of the military airport and that's it, no carnet or document checks that I remember.
Taking the plane is a bit of a hit or miss though. I've heard other travelers not being able to get on it. Basically some high official will have to let you on and will probably pocket most of the money. We paid around 230 USD each. Go to the military airport gate at least the day before you want to fly and hope for the best.
Good luck!
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