Just for your info guys, according to AEROPUERTOS ARGENTINA 2000, the owner of most of ARG airports, there are several info I found there....
1- IGR airport is called "CATARATAS DEL IGUAZU" and serves the near city of Puerto Iguazu.
2- NQN the name of the city is Neuquen. (incorrect spelling in the game)
3-BHI, the name of the airport is "Comandante Espora" and serves the near city of Bahia Blanca.
4- MDQ, the name of the airport is "ASTOR PIAZZOLLA", and serves the near city of Mar del Plata *also misspelled in the game*
5-UAQ, the name of the airport is misspelled and it is "DOMINGO FAUSTINO SARMIENTO" serves near city of San Juan
6- MDZ- The name of the airport is "Aeropuerto Internacional El Plumerillo" serves near city of Mendoza
7- IRJ, it is completely absent in the game.....Name of the airport is "Comandante Vicente Almonacid" and serves the city of La Rioja
Hopes this info helps!