Thanks
Mavalenzu for this quick info.
Let's see if somebody else knows a bit more about it like who gets access to it and about opening hours.
My flight to Buenos Aires was rescheduled and now leaves at 5 AM.
But as I've heard different stories about the Check In procedures in Asunción I want to be there early.
So it would be nice to spent the remaining time in the loung insteading of "hanging around" with the crowd of people.