Technicalities dear Craggenmore, the kind of which I'm sure my colleagues at other (legacy) airlines have to endure once in a while. At least we do not transition to earlies.
At the moment I'm following a nice discussion at the worlds oldest airline regarding age discrimination and pilots who 'dare' to fly beyond their 56th birthday. So much emotion, so much hatred for their own colleagues, my goodness. I thought those guys were the happiest people on the planet flying for the best of the best...
Actually I understand perfectly well what they are going through, it just shows that everything is relative and that the grass is never really much greener.