Depends if you're on my team or not
I don't know about banshees, but I went 49/0 with a ghost once. Twas glorious.
me and a friend managed in Halo 3 to go 50/0 between us in a warthog, I totalled around 20 splatters, and he massacred them with the chaingun. the rest of the team was just trying to keep us alive at that point.