Airline, air or airline company, is a company that provides air transport services of passengers, cargo or mail, regular character or not. The aircraft used for this purpose are commonly known as airliners.

Several companies join in airline alliances to increase their competitiveness by reducing costs and sharing or sharing flights. These companies require the granting of routes or airlines by governments of the countries where its overflying aircraft.

Airlines can be classified as international, national, regional, domestic, low cost (low cost), scheduled flights or charter flights (charter flights), depending on the chosen methodology.
The first airline was created in Germany by Ferdinand Graf von Zeppelin on November 16, 1909, the "DELAG" (Deutsche Luftschiffahrt-Aktiengesellschaft, which can be translated as German Society for Airship Transport), carries approximately 34,000 passengers between 1910 and 1913. in 1914 Tony Jannus started the first commercial flights in the United States in Florida.

The first company to use aircraft was the Aircraft Transport and Travel UK in 1916, using the Airco DH.4 aircraft modified for 2 passengers with flights between Folkestone in the UK and Ghent in Belgium, later in 1916 the company acquired aircraft Airco DH .16 for 4 passengers.

In 1919 several companies were created, the Handley Page Aircraft Company which used aircraft Handley Page Type O with capacity for 19 passengers, in France two companies were created, Société Générale des Transports Aériens and the Compagnie des Messageries Aériennes1.

In 1920 he was created by Albert Plesman the Netherlands Koninklijke Luchtvaart Maatschappij (KLM), currently the oldest company still active, with Airco DH.16 aircraft and that made flights from London to Amsterdam. In 1923 was created in Finland Aero Y / O (now Finnair), and in 1932 was created in Russia Deutsch-Russische Luftverkehrs AG with flights between Russia and Germany, which currently uses the name of Aeroflot.

In 1923 two French companies have merged creating the Air Union, current Air France. In 1926 Luft Hansa Deutsche was created