Premise: Pécs-Pogány Airport (Hungarian: "Pécs-Pogány repülőtér" ) or "Pécs South Airport" (IATA: PEV, ICAO: LHPP) is a small commercial airport serving Pécs, a city in Baranya County in Hungary. Several aviation database sources incorrectly cite the IATA code for Pécs-Pogány as QPJ, however the IATA website lists it as PEV.
Hypothesis: Several aviation databases source the wrong IATA code because of system error