Can SkyDemon activate a Flight Plan? If there is no ATC at the departure aerodrome and no person who can do this I'd like to know if it is possible to activate the plan oneself either on the SkyDemon iPad app or using the customer zone on the SkyDemon website where one can manage Flight Plans.

Apparently this does work differently in different countries. In Sweden it is without any doubt ATS and not AIS that opens and closes flight plans. E.g. to close a flight plan after landing at an airport without ATS, you phone the ACC.