Yes! I tried to go that way. But: In the thread is written: "..open the FlightData.Cat, and extract the SingleMission.ini. "
Well! First Problem: I did not find any SingleMission.ini in the FlightData.Cat. But I found one in missiondata.cat
I changed that SingleMission.ini
Now, where exactly must I put this modified singlemission.ini to?
I did not know where to put it. So I put it there: WoV\Flight\missiondata\singlemission.ini
and there: WoV\Flight\singlemission.ini
It did not have any effect.
So I found the the aircraft_data.inis of all NVAF planes in the ObjectData.cat, copied those into the plane folders and changed the
ServiceEndYears to 2020.
Success!