It might be a English translation of a Danish way of saying "business jet". Talking about the type of plane. As opposed to bigger commercial jets. E.g. a Gulfst

It might be a English translation of a Danish way of saying "business jet". Talking about the type of plane. As opposed to bigger commercial jets. E.g. a Gulfstream V is a business jet often used by business people. Even when used or owned by government, some people might keep calling it a "privatfly" - private plane.