We must differentiate between
Lag and
Ping.
In either case it does not effect the player doing the shooting as all the calculations and hits, are done on this players computer, then passed to the server , then onto your computer - where you suddenly find pieces falling off your plane when your attacker is, according to you, off target. This happens because you are, according to the attacker, in his sights.
The Ping factor is the major cause of this feature.
Lag is network packet loss, that has the effect of making your's or other aircraft to fly funny - wierd rotations, fly underground, beam into outer space. And when the connection with the server is re-established cause that plane, or all others to teleport to their real positions - A sight to behold.