Great question - DUD to DXB just means Dunedin Airport to Dubai Intl Airport. Now you’ll know what these unique codes when you look for flights! Abu Dhabi Zayed Intl Airport (AUH), Sharjah Airport (SHJ), Dubai Al Maktoum Intl Airport (DWC), Abu Dhabi Bateen Airport (AZI), Ras Al Khaimah Airport (RKT) are other airports near this flight route and their unique identifiers/IATA codes.