These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Jeddah King Abdulaziz Intl Airport to Mangalore Bajpe Airport flight would often be abbreviated as a JED to IXE flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Riyadh King Khaled Intl Airport (RUH), Dammam King Fahad Intl Airport (DMM), Medina Mohammad Abdulaziz Airport (MED), Abha Airport (AHB), Tabuk Airport (TUU).