Thanks for the input guys.
One thing I thought I should mention too;
The "Spooky" gunship was likely included in DG-VN (by Majog and Co.) as a movable, controllable unit because it, like the helicopters, had the ability to linger over the target. In fact, that's how they were meant to be deployed. In WWII, I would think that the only units that would qualify for this "loitering" behavior would be smaller, tactical bombers, and possibly some types of fighter planes. Big strategic bombers, as far as I'm aware, would never make strafing runs at an enemy, or linger over a battle looking for kills the way that the "Spooky" gunships would. I just thought I should clarify that.
I'd like to add that many of the U.S. fighter planes in WWII hadn't the fuel for this kind of loitering stuff until a front was opened in France (the allies had no further need to cross the channel, and they now had bases nearby). So I would think any WWII air units designed to be controllable would likely be A-25's and B-26 bombers and the like (with their lower firepower). Possibly P-51 Mustang fighters late in the war, maybe even P-47's in the Italian theater, but I digress.
I just kind of like the idea of a flying unit being able to be shot down - keeps the aircraft's owner on his toes, and keeps these types of units from being too powerful.