Nepal Airlines Corporation is the flag carrier airline of Nepal. Its head office is in the Nepal Airlines Corporation (NAC) Building in Kathmandu, and its main base is Tribhuvan International Airport, Kathmandu. The airline was established in July 1958 as Royal Nepal Airlines Corporation (RNAC) to be Nepal's first airline. The airline's first aircraft was a Douglas DC-3, used to serve domestic routes and a handful of destinations in India. The airline acquired its first jet aircraft, Boeing 727s, in 1972. As of May 2017, the airline operates a fleet of ten aircraft.