I can see that being very true. Holiday Season are some of the most profitable times of the year for many airports, both minor and major ones.
I see Dubai being a Hub profitting from all the Holiday Season traveling, but as for Business between Singapore and Finland, that may not hold as true as it does other times of the year, perhaps.
Looking at it, there seems to some mor travellers going to Singapore than to Finland, if we were to base that information purely of which altitude it climbs to, in early stages of its flight, but that isn’t a strong enough reason to be true, that there are indeed more people flying one direction or the other.
As for Holiday travels it can go in all directions, to anywhere, and at various amount of demand. Some airports really see a huge boost during Christmas, and certain airlines, depending much on their route network and hub location will see a increase in travel with their airline to particular destinations.
I know for a fact that many people from Scandinavia fly to Bangkok, Bali and other Asian tourist hotspot location over the winter. So for all we know, it could be that there just seems to be somewhat, slightly more people and cargo flying to Singapore fore Christmas and New Years than the other way around.