Well, gliders could have some utility if:
1) They carried more troops than a C-47;
2) They could carry a useful alternate cargo, i.e. a Jeep w/mg, a howi, etc;
3) and this is the big one, they could land someplace the C-47 couldn't. Right now, it's no problem to set a C-47 down anywhere, regardless of whether you have a runway or not. Gliders were used by the allies because they could set down on very short pieces of real estate. They also didn't require specially trained troops, like paratroopers; any grunt could ride in one. In fact, at the time of D-day, Allied glider-borne troops didn't get any kind of extra pay like their paratrooper brethern. If the terrain modeling were such in AH that landing a C-47 off-field offered significant risk to your virtual life, while gliders didn't, people might be inclined to use them more.
Anyone know if a C-47 could pull more than one Waco at a time? Just curious. Another reason gliders were used was the limited training required to prepare a glider pilot, compared to a fully trained powered a/c pilot. There's no way to model this in the game, however. We could give glider troops longer range (once disembarked), too. That would mean you could land at a greater distance from the objective, and the glider troops would then make for the target on foot.
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Sabre, a.k.a. Rojo
(S-2, The Buccaneers)