OMG, SO FRUSTERATED!!!!!! Plz Help

Hey, I really need help with this one, it has me completely stumped. I recently played Harrier Command V1.9 FIXED - The Hive Workshop - A Warcraft III Modding Site, and I wanted to make my own plane game, so I came up with this recurring question (IT HAS STUMPED MY FOR LIKE 2 MAPS!).
If you know the answer to this question, give it here. Please!

Shoot

Events

Time - Every 0.10 seconds of game time

Conditions
Actions

For each (Integer TempIntA) from 1 to 12, do (Actions)

Loop - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

Shots_Left[TempIntA] Greater than 0

Then - Actions

Set TempLocA = (Position of Fighter_Vehical[TempIntA])
Set TempLocB = (TempLocA offset by (Random real number between -70.00 and 70.00) towards (Cam_X[TempIntA] - 90.00) degrees)
Unit - Create 1 Stats_Missile_Type[Gun_Type[TempIntA]] for (Player(TempIntA)) at TempLocB facing ((Angle from TempLocB to Shot_Target[TempIntA]) + 0.00) degrees
Set O = (Distance between TempLocB and Shot_Target[TempIntA])
Set A = (Current flying height of Fighter_Vehical[TempIntA])
Set H = (Square root(((Power(A, 2.00)) + (Power(O, 2.00)))))
-------- I need somthing here that will find the trajectory angle. --------
Unit - Set mana of (Last created unit) to (90.00 - (TempRealA + 0.00))
Animation - Change (Last created unit) flying height to (Current flying height of Fighter_Vehical[TempIntA]) at 1000000000.00
Set Shots_Left[TempIntA] = (Shots_Left[TempIntA] - 1)
Custom script: call RemoveLocation(udg_TempLocA)
Custom script: call RemoveLocation(udg_TempLocB)

Else - Actions

Now, to the explaining about the map. You fly a plane in a 3d sky, with the ability to fly in any direction, up, down, left right, all controlled by the arrow keys. Now, when you want to shoot, you right-click, and that sets the shot target, and increases the Shots_Left variable. Now, what has been stumping me is that I cant find the angle between the newly created unit and the target. (The angle between points doesn't work because it isn't a facing angle, its a trajectory angle.

|\ <---- I need the angle here!
|-\
|--\
|---\
|----\
|____\

Let me get this right. You got a unit it the air, O, and he is shooting at a unit on ground, X, and you need angle, BAC? If that is the case I think I can help you out, but I need to know if it is.

O
A
|\
|=\
|==\
|===\
|====\X
B``````C

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Ok see if this helps: