'Blurry' is kind of getting into my topic
Blurry means that the picture did not completely 'freeze' the movement of the airplane, or, in cases where the aircraft is standing still, the camera movement (shaking). Your pictures are fine examples of that slight and subtle level of blurriness that we often see but are not that apparent to the photographers.
- Helo picture: If you look at the registration, landing lights or the landing gears, you'll see that they are not sharp. Moreover, you should notice that the softness does not come from lack of sharpening but from a slight movement of the subject while the picture was taken.
- Air Berlin: Look at the 'airberlin.com' titles, registration, tail and landing gears, and you should see again that they are not sharp. Again, you should notice that the softness does not come from lack of sharpening but from a slight movement of the subject while the picture was taken.
Without looking at the originals I cannot say if your pictures are salvageable or not, that is if careful sharpening can overcome the slight blurriness without oversharpening the picture.
I can fully understand that for many photographers it is a bit difficult to actually see this subtle blurriness. It is more a matter of looking at many pictures and training your eye. Another way of recognizing the blurriness is that the pictures will look soft, and then oversharpened, but never actually correctly sharpened.
Btw, I think that helo shot could be a bit brighter, and the Air Berlin one would look better with a slight ccw rotation.
Hope it helps