Short answers, pulled from the story.
British Airways officially merged four companies to form a single entity on the 31st of March 1974. This consolidation combined BOAC, BEA, Cambrian Airways, and Northeast Airlines under one brand.
Aircraft Transport & Travel began operations on the 25th of August 1919 with a flight from London to Paris. It was the first company to operate daily international commercial air service between two nations before merging into Imperial Airways in 1924.
Commercial supersonic travel operated by British Airways and Air France began on the 21st of January 1976. The final Concorde flight departed New York-JFK for London-Heathrow on the 24th of October 2003 after 27 years of operation.
On the 28th of April 2020, British Airways announced plans to make up to 12,000 staff redundant due to the global collapse of air traffic caused by COVID-19. The airline received government bailouts including £300 million and an additional £2 billion state-backed loan in 2021.
Mixed Fleet cabin attendants ended their walkout on October 31st after 85 days of discontinuous strikes that began in January 2017. They accepted a new pay deal from British Airways following one of aviation history's longest running disputes.