Oh, look, it's the neverending Balrog-wing debate! Knew there had to be one of these in here somewhere . . . there's one everywhere else . . .
If the Balrog of FotR did have wings, it wouldn't have mattered; as stated above, there wasn't enough room in the place for it to have used them properly, particularly once it started falling down into the chasm. Whether you accept the movie as cannon or not, it does a good job of the visuals there; watch it again and try to picture the creature actually flapping those wings and hitting the sides of the cavern, doing itself absolutely no good.
In addition, the wings probably wouldn't be big *enough* to support the Balrog's body in flight *anyway*. They do, however, have a great deal of use in open-space fighting (if you know how to use them) and do have a more imposing effect. After all, they were servants of Morgoth, who liked terror.
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