The first computer flight plan I saw was one developed by R. Dixon Speas for the B707, circa 1974.
Dead accurate*, even better than what PanAmerican was using at the time.
So-called computer flight plans can lead you right and truly down the slipprey slope, IF you don't check 'em carefully.
*How accurate?
Plus or minus two minutes on an Atlantic crossing.
Dixon Speas had the old IBM computer system, and it worked like a charm, even if it did consume half the electric power in Buffalo, New York.
