LDY and COK are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. LDY to COK refers to a flight route from Londonderry Eglinton Airport to Kochi Airport. Thiruvananthapuram Airport (TRV), Kozhikode Airport (CCJ), Kannur Intl Airport (CNN) are some additional IATA codes for airports related to your trip.