Airlines established in 1919

KLM Royal Dutch Airlines, or simply KLM (an abbreviation for their official name Koninklijke Luchtvaart Maatschappij N.V. , ), is the flag carrier of the Netherlands. KLM's headquarters are located in Amstelveen, with its hub at nearby Amsterdam Airport Schiphol. It is a subsidiary of the Air France–KLM group and a member of the SkyTeam airline alliance. Founded in 1919, KLM is the oldest operating airline still using its original name, having gone through significant changes in its ownership and legal structure over its history, including a period of majority government ownership. The company

1919-1923 airline in France

Sociedad Colombo Alemana de Transportes Aéreos (SCADTA; ), was the world's second airline, and the first airline in Latin America, operating from 1919 until World War II. After the war, SCADTA merged with Colombian regional carrier Colombian Air Service (), or SACO. Together, SCADTA and SACO formed Avianca - Aerovías Nacionales de Colombia, the Colombian flag-carrier. Avianca still operates to this day and claims SCADTA's history as its own, thus making it one of the world's oldest active airlines.

first Swiss airline

former French airline (1919–1933)