Copa was established in 1947 by a group of Panamanian investors and Pan American World Airways, which provided technical and economic assistance as well as capital. Initially, Copa served three domestic destinations in Panama with a fleet of three Douglas C-47 aircraft. In the 1960s, Copa began its international service with three weekly flights to cities in Costa Rica, Jamaica and Colombia using a small fleet of Avro 748s and Electra 188s. In 1971, Pan American World Airways sold its stake in Copa to a group of Panamanian investors who retained control of the airline until 1986. During the 1980s, Copa suspended its domestic service to focus on international flights.
In 1986, CIASA purchased 99% of Copa, which was controlled by the group of Panamanian shareholders who currently control CIASA. From 1992 until 1998, Copa was a part of a commercial alliance with Grupo TACA's network of Central American airline carriers. In 1997, together with Grupo TACA, Copa entered into a strategic alliance with American Airlines. After a year our alliance with American Airlines was terminated by mutual consent.
On May 6, 1998, Copa Holdings, S.A., the holding company for Copa and related companies was incorporated as a sociedad anónima under the laws of Panama to facilitate the sale by CIASA of a 49% stake in Copa Holdings to Continental. In connection with Continental's investment, we entered into an extensive alliance agreement with Continental providing for code-sharing, joint marketing, technical exchanges and other cooperative initiatives between the airlines. At the time of our initial public offering in December 2005, Continental reduced its ownership of our total capital stock from 49% to approximately 27.3%. In a follow-on offering in June 2006, Continental further reduced its ownership of our total capital stock from 27.3% to 10.0%. In May 2008, Continental sold its remaining shares in the public market. In March 2010, CIASA sold 4.2% of its interest and as of December 31, 2018 held 25.9% of our total capital stock.