Originally Posted by
AviationFreak
Not entirely true - non-elites can pay for seat assignment on light fares ahead of time using the AF/KL website (except for some flights, like those operated by Hop). Silver and Gold members can assign standard seats for free; Plat+ can assign any seat (incl. exit row, etc.) for free.
^^^This.
Only upgrades are DOD. But eco light purchased on AF/KLM sites maps to Main (V) for the flights op. by DL. So elites can still select seats free of charge right after booking.