Something else about sights in CoD, ....
when I am for example flying the 109 and dogfighting with a Hurricane,
I do not loose it so quickly out of sight even if we turn and turn quite a bit, I still keep track of it. Of course harder against the ground than against the sky but still, I can follow it and eventually bring it down, if it does not bring me down first.
On the other hand, when I fly as the last bird in a formation and start leaving the formation just to fly behind it some barrelrolls or some other maneuvers, I loose the formation faster than the Hurricane in the dogfight, although, it should be easier to keep track of a steadyly moving big object like a formation of planes.
That happened of course also some times in the old IL2 but there you found your formation again very quickly, whereas in IL2-CoD you might need a few moments to find it again. If it takes too long, you have lost them for good.