Before revision: Czech airspace Ljubljana ACC (LJLA), controlling Slovenia FIR Following the PETAL I and II (Preliminary Eurocontrol Trial Air Ground Data link) trials in 1995 including NEAN (VDL Mode 4), today both ATN (VDL Mode 2) and FANS 1/A services are supported.
After revision: Vienna ACC, controlling Austrian FIRCzech airspace Ljubljana ACC (LJLA), controlling Slovenia FIR Following the PETAL I and II (Preliminary Eurocontrol Trial Air Ground Data link) trials in 1995 including NEAN (VDL Mode 4), today both ATN (VDL Mode 2) and FANS 1/A services are supported.