You want an uninterrupted good 1v1? Go to the Dueling Arena, that's what it's for. Now as a rule though, I do generally ask a guy if he needs help. If there's a huge fight going on I may not.
We're there to kill the enemy and take bases in the Arenas. It's suppose to be a reflection of the real war. Don't think they ever taught a guy to go 1v1 on purpose. Yes we have our furballers and there are places on the map usually with them in mind. Myself, feel free to kill anyone around me.... please!
There is one exception. That is when someone has already knocked a wing off or has burned the enemy. That's his kill that is not to be stolen. Problem there tho is I've seen planes with half a wing still flying and the guy leave thinking he's dead. Just have to go with the flow.