>>717479150
Call me crazy but I'm pretty sure I remember nearly all covie weapons having different velocities on plasma weapons. Both for small-arms and vehicles. Not to mention their space ships which undoubtedly have to be comparable to UNSC missile speeds at the very least to fight across however many kilometers in space ship vs ship combat usually happens at.
So I think a banshee wouldn't have an issue fighting a fast-moving fighter. Hell, you can take damage in Halo Reach's fighter section when just banshees are around. And thats a super advanced craft, not an airplane from ww2.