After the frenchman Clément Ader was the first to take off a flying machine in 1897, in the following years many inventors tried to be the pioneers in inventing an airplane. Their prototypes were very useful for combat in the First World War, but it was not until the end of the war that the first companies dedicated to the transport of passengers appeared. The first airlines were born between the 1920s and 1930s. Below, we will review the five oldest and still operating today, which has its merit considering the continuous changes to which companies have had to adapt in recent years.
