British Airways was officially formed in 1974 through the merger of British Overseas Airways Corporation (BOAC) and British European Airways (BEA), along with two smaller airlines, Cambrian Airways and Northeast Airlines. However, its history extends back much further, with roots in the world's first international scheduled air service established in 1919. The airline was nationalized until its privatization in 1987. 

Here's a more detailed look at the key milestones:

• Early Beginnings:

  British Airways' history includes the world's first international scheduled air service, launched in 1919 between London and Paris, according to British Airways. 

• Formation of BOAC and BEA:

  BOAC was formed in 1940 by merging British Airways Ltd and Imperial Airways, while BEA was established in 1946. 

• Nationalization and Privatization:

  After World War II, both BOAC and BEA were nationalized, and in 1974, they merged to form British Airways. The airline was privatized in 1987. 

• Expansion and Mergers:

  In 1988, British Airways merged with British Caledonian Airways, further expanding its operations. 

• Concorde Era:

  British Airways operated Concorde, the supersonic jet, until 2003. 

• Modern Era:

  British Airways continues to be a major global airline, part of International Airlines Group (IAG) since 2011.