A very difficult but important question. Obviously affected by the facts of the case, and we only have a brief idea of these. I don't disagree with the sentiments of the last two posts exactly, but I am not sure that nothing should be done, and that the error should go unmarked by the authorities.
The aspect that concerns me is the need for a deterrent for others in the future.
It is, of course, complicated because there is at least an argument that part of the problem lay with the regulator (i.e. the CAA) according to previous posts. I am worried if there is a suggestion that an individual is being used as a fall-guy or scapegoat.
I tend to agree with the view that a prison sentence would be of little point (in respect of the individual). Like in so many legal areas it is often difficult to find a suitable "punishment".
But I think that something probably needed to be done.