Taking my first KLM flight since 2007(!) in March. UK-AMS-Caribbean & return. I can pay for seat selection in advance or wait until check in. At online checkin, do all seats become free of charge to select? I’m guessing perhaps not economy comfort, but what about “front section seats” or exit row seats?

Also are (alcoholic) drinks paid or free in economy?

Hoping to be able to buy up to Business for the return long haul (overnight) leg at online check in or at the airport. If it’s in the €500-600 range I would go for it, as the original Economy ticket was a very good deal.

Last question: does online check-in open up for the long haul leg at the same time as for the short UK-AMS
hop, or is it 30hrs before each leg?