re: HN39 (#4112)
HN39, I agree, if the x axis is the reference for AoA then theta = gamma + alpha. Then in level flight [gamma = 0]: theta = alpha. By the way, the choice of a reference for AoA is somewhat arbitrary.
This still leaves AF447 less than 1 deg away from stall warning, if the 4.2 deg AoA triggering threshold is true.
DJ.