It's only a HO if you're the one that gets shot down, otherwise, according to the old schoolers, it's a 'Front Quarter Angle Shot' or so I'm told.
I Always HO. You can save all that Quasi-Ettiquete for the DA where it belongs, like I said before, if I get a shot, I'm taking it. If you're foolish enough to approach a plane with cannon head on, you deserve your firey death.
-Twitchy