Lacsa (Spanish: Lineas Aéreas Costarricenses S.A.), is the national airline of Costa Rica. It operates international scheduled services in Central, North and South America. All international services are now operated by Grupo TACA. Out of the five airlines that made up the original TACA alliance, Lacsa is the only airline of the group that still operates international flights with its own IATA code and flight numbers. As a subsidiary of Grupo TACA, the airline is also known as TACA/LACSA.
Lacsa was established in 1945 by Pan American World Airways, the Costa Rican government and Costa Rican private interests. It started operations in 1946 and was designated the national carrier in 1949. Its domestic network was transferred to wholly owned subsidiary Sansa in September 1959.