GRU is a unique code, commonly called an IATA code, used in the aviation industry to identify airports. This code, along with many others, are defined by IATA (International Air Transport Association). A GRU flight refers to a flight to Sao Paulo Guarulhos Intl Airport. This flight destination has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Sao Paulo Congonhas Airport (CGH), Sao Paulo Viracopos Airport (VCP).