you can get a good estimate of your aoa using the pitch ladder and the gun sight. There is about 1/2 to 1 deg difference between 221 and 250.
HiTech
I have also used the .target command to note the difference speed has on AoA. I actually did this a while ago when creating a gunsight for the K-4 that had hash marks set for 800 yards at speeds of 275, 300 and 325. If you are chasing someone who is extending level, the faster you are the more you need to raise the nose to "loft" a tater out at them. There is still a ton of dispersion at that distance, but every once in a while the gunsight worked and I could nail somebody running away, much to my satisfaction (and the aimbot claims that come with it).
I also noted when working on my gunnery course and using the .target command, that the Corsair in auto-level at 250mph will start with the pipper well above the bullseye and that it drops in line with the bullseye when you reach 300mph level.
So, I think with some simple trigonometry and the .target command you can figure out the angle at various speeds in level flight. The velocity vector and the target form a right triangle. The vertical distance between the pipper and the bullseye would be the length of the side opposite the angle. The distance to the target is the length of the side adjacent to the angle.
The trig formula for calculating that angle (alpha) is: tan (alpha) = Opposite / Adjacent
which converts to: alpha = arctan (O/A).
So, if the pipper is 15-feet above the bullseye at 300 yards (or 900 feet) then the calculation is: alpha = arctan (15/900) which gives an alpha of .995 degrees.
Check my math, but I think this is right.