User blog comment:Kyvos/Do Jeff and Monty just like birds, or is something bigger going on?/@comment-3387274-20140309161317

wings and flight generally are a motif for overcoming difficulties or breaking boundaries, which tends to be a common theme for the kind of anime RWBY is based on. More to the point, however, all of those songs seem to have that as an underlying theme as well, so the flying motif would be all but inevitable in there.