Tribhuvan International Airport (Nepali: त्रिभुवन अन्तर्राष्ट्रिय विमानस्थल, IATA: KTM, ICAO: VNKT) is an international airport in Kathmandu, Nepal. The airport is about six kilometres from the city centre, in the Kathmandu valley. It is the sole international airport in Nepal and has served as an airfield since 1949. The airport was inaugurated in 1955 by King Mahendra and received its current name in 1964. Originally a grass runway, it was re-laid in concrete in 1957 and has been extended several times.