Aircraft is every machine capable of flying (helicopters, planes, blimps etc). The only term I could imagine would mean the same in Norwegian actually came back as just meaning plane (flyvemaskin = fly. Much as automobil came to be bil I guess)
Does that mean that the plane is a Norwegian one, or could it also be an German one that is just coming from Oslo? I think the English sentence could/would mean the latter, but I'm not sure about the Norwegian sentence.