Recurring common problem

[Seesee]

OK, I'm a bit fed up with getting CA and various fringing on some of my pix, in particular birds in flight. It's common on most of my longer reach lenses including and and often on my Nikon 80-200 f 2.8 AF ED. Is it my technique, the lens or the D50, or all and can anyone give me some tips on how to avoid it. It's often difficult enough to get birds in flight shots, and even more frustrating to get home and find defects like CA and fringing.....see pictures

The Nikon 80-200 is supposed to be a Pro grade lens, so it must be me or my camera body......any thoughts .