Skurj, AoA is the angle at which the air is travelling over the wing. I believe you mean Pitch.
Air wing
------->...... /____/
................./____/
(Observe my uber leet acsii skills)
That'd be AoA of a plane that just nosed down and had little vertical speed, of course the wing would be at less steep of an angle, but, you get the idea.. but once the aircraft picks up vertical speed, the air would be..
..air
.../\
../..\........wing
..//......../____/
.//......../____/
.. Relative to the aircraft, so in a dive with enough speed, the AoA could normalize again..
Pitch..
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That is be the only angle a level bomber should be able to bomb at.