Terminal Velocity
HazelNuts, henra, Machinbird...
In your terminal velocity calcs, can you include a time variable -- how much time required to fall, say, 35,000 ft.?
With the leaning tower and the feather and stone experiment in mind, seems that a stalled A/C would descend more rapidly at higher altitudes, slowing gradually (smooth asymptotic curve) as air density (drag) increases until sea level. Perhaps 200t of mass overwhelms the influence of fluid density, but theoretically, I should think Terminal Velocity (where drag=weight) would vary by altitude...
Without simulations, hard to tell how much residual aerodynamic lift might also be at play in (what kind of) a stall. Not enough lift to keep the A/C flying, of course, but possibly not zero, either, thus a factor to include when computing Terminal Velocity and estimating duration of fall.
GB