Great question - CAI to IST just means Cairo Airport to Istanbul Airport. Now you’ll know what these unique codes when you look for flights! Antalya Airport (AYT), Istanbul Sabiha Gokcen Airport (SAW), Izmir Adnan Menderes Arpt Airport (ADB), Ankara Esenboga Airport (ESB), Kayseri Airport (ASR) are other airports near this flight route and their unique identifiers/IATA codes.