On the 20th of May, 1933, law no. 2186 laid the foundation for the "State Airlines Administration" in Ankara, as a department of the Ministry of Defence.
In its early days, the airline operated one King Bird, 2 Junkers F-13s, and one ATH-9.
After being turned over to the Ministry of Public Works in 1935, the airline changed its name to "General Directorate of State Airlines" and was operated under the Ministry of Transportation just three years later.
In 1945, the first Douglas DC-3 was added to the fleet, while the first international flight, Ankara-Istanbul-Athens, took place two years later.
During early 1956, the airline was reorganized, changing its name to Türk Hava Yollar? A.O. having a capital of 60 million TL.
During the late 1950s, F-27 and Vickers Viscount aircraft are added to the fleet, followed by the first DC-9 jets, in 1967.
In 1971, the first Boeing 707 joined the fleet, followed by F-28s and DC-10s only two years later, and Boeing 727s, in 1974.
In 1984, the capital was raised to 60 billion TL, and the airline was reclassified as a State Economic Enterprise.
One year later, Airbus A310s were added to the fleet.
In 1987, the capital was raised to 150 billion TL, one year after Singapore joined the network, and one year before New York (via Brussels) was added.
In 1991, Boeing 737s were added to the fleet and the registered capital reached 2 trillion TL.
Two years later, THT (Turkish Air Transportation) merged with Turkish Airlines, and new aircraft joined the fleet (Airbus A340-300 and RJ-100).
In 1994, direct flights to New York were introduced, and registered capital was raised to no less than 6 trillion TL, only to reach 10 trillion TL the following year.
In the following years, the fleet continued to receive new aircraft, and various new routes were introduced.
The Frequent Flyer Program "Miles&Smiles" was launched in October, 2000.
In 2001, as new routes and aircraft continued to join in, the Reservation Call Center (444 0 THY / 444 0 849) service was inaugurated.
Turkish Airlinws decided to join the Star Alliance on the 4th of August, 2006, in the middle of a period of sustained growth on all levels.
In 2007, Turkish Airlines Star Ranking status has been upgraded from 3 Star to that of a 4 Star Quality Certified Airline status.
In April, 2008, Turkish Airlines was the seventh European airline that joined Star Alliance, becoming the 20th member of the network.
In 2009, Turkish Airlines and Asiana Airlines have signed a codeshare agreement.
Beginning 2010, Turkish Airlines has been ranked continuously as the best airline in Southern Europe.
From 2011, for three years in a row, Turkish Airlines was ranked among the first ten in The World's Top Airlines and the best airline in Europe.
In 2012, Turkish Airlines was the first European airline to resume flights to Somalia since the start of that country's civil war.
In 2013, Turkish Airlines has continued to expand and rejuvenate its fleet ordering 117 aircraft from Airbus and 95 aircraft from Boeing all to be delivered until 2021.
In 2014, Turkish Airlines presented the first aircraft equipped with new seats created and built by a partnership between Turkish Airlines, Turkish Seats Industries and Turkish Technic. The seats will be installed initially on B737-800 aircraft, and then on the A319, A320 and A321 aircraft.
During its long history, Turkish Airlines was only involved in 3 accidents on international routes, and 18 on domestic flights. The first accident occurred in 1959, when a Vickers Viscount Type 793 crashed in heavy fog at London Gatwick Airport, just before landing, causing 14 fatalities of the 24 people on board. The last deadly accident involving Turkish Airlines took place on the 25th of February, 2009, when a Boeing 737-800 crashed near Amsterdam Schiphol Airport, killing 9 of the 135 people on board.