I keep receiving airport slot warnings for a route whose airport has been closed 5 game years ago.
It is VCE-BBU. I've no unused slots in Venice and, of course, cannot check the slots on the closed Romanian airport.
Another odd thing is that I get the warning with the IATA code (VCE) for Venice and ICAO code (LRBS) for Bucharest.
This is game #2.