This is just an IATA (International Air Transport Association) code. IATA codes are used in aviation to identify and differentiate airports. That’s why a Thiruvananthapuram Airport flight would often be abbreviated as a TRV flight.
If you book a flight to Trivandrum, you will be flying into Thiruvananthapuram, which is the city’s only airport. Thiruvananthapuram (TRV) is located 3.2 km from the center of Trivandrum.
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