And I take it that the emergency exit seats cannot be assigned ahead of time? But looking at the seat map where the 3-4-2 seats are arranged, I can see that some seats are 'unblocked'. So maybe I will call AY later today and see if I can get access as AA-PLT. Or not.
Anyway, I shall be at the airport 3 hours prior departure so I hope that'll be fine.
Thanks all!