Some of the AHI modeled aircraft do not seem to have received the new allowances for head movement, notably the P-40E has more or less the same range of motion as it did prior to the most recent update. This can be contrasted to aircraft like the spitfires and typhoon which now allow you to move your head up so far that the canopy is at eye level. It is not much of a bug so much as something that could use a bit more refinement.