He has only lost out on the internal appeal. His next step would be to lodge the case at an employment tribunal. However, I do not think that he has much hope in that arena. The criteria would not be, was the reason for sacking correct or not. It would be, whether the procedures leading up to the sacking were fair. This would take into account any prior warnings etc..
As a matter of interest, a question to those who think that he has been harshly treated because he should have some say on what happens on his plane. What would constitute a breaking of a rule that should lead to sacking?
I ask out of genuine interest. I have no thought one way or the other over Pablo's demise.