In reply to radson:
> (In reply to AndyC)
>
> The worst that can happen is that they not reply.
No, the worst that can happen is that they offer you some generous deal, you take it, even get a letter for proof, then turn up at the airport with 40kg of excess only to find the deskperson will have none of it, letter or not, it's too late to change anything and you end up paying full whack xs on an economy seat ticket.
Actually, no, the worst that can happen is that lots of people bribe the deskpeople to whack in a few extra kilos and the overloaded plane smacks into a hillside rice paddy on the approach to landing
Hopefully the Business Class thing works for you, let us know if it works out. It was always touted as a solution, but the problem was it used to be possible to fly Economy, then smile and cajole and niggle in several extra kilos on Thai's 25kg + carryon, so you ended up taking nearly 40kg total for no extra cost. But those days are gone.
Anyway, 60kg? Is that taking Personal Dwarf Sherpa and fresh undies for every camp?