ISO100,
I would have to agree with you.
If the details are as 'Flyblue' suggests and the take off time was only 25 mins before airfield closure (including extensions) for what must be around an hour flight time, then they must have known before push back that they were not going to make it.

not good.
Jail still seems too harsh to me though. A slap on the wrists, even demotion and a company fine would be more fitting.
The point in all this is that the end result will be much more cancellations and allot more cheesed off passengers as Capt's who are in with a small chance of not arriving to the destination in time simply say "I'm not risking jail, flight cancelled".
The sad thing is that when I have been close to not getting in but still in with a chance, I have occasionally taken a quick vote via the PA and asked how many passengers still want to have a go......the result is always a resounding YES.
If these guys go to jail our future passengers won't even get the choice.