Great question - HRE to NAN just means Harare Airport to Nadi Airport. Now you’ll know what these unique codes when you look for flights! This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Suva Nausori Airport (SUV), Labasa Airport (LBS), Taveuni Island Matei Airport (TVU), Savusavu Airport (SVU), Kadavu Island Kandavu Airport (KDV).