Originally Posted by NickB

Same rule on all FFP that I know of: as long as your flight keeps the same number, you earn miles based on the great circle route from origin to destination. So, if there was such a thing as CDG-SXM-AMS on the same flight number and you flew it in continuation, you would still earn only CDG-AMS.
This is very common with US airlines, where you might even have to change planes ("change of gauge") and yet still earn as if you were on a nonstop flight.