On 01 September 1972 The British Airways Group was established, which would eventually result in BOAC and BEA being dissolved on 31 March 1974 upon the formation of British Airways.
British Airways Concorde poster, 1980s, credit
British Airways helicopter British Airways logo from 1973-1982
British Airways livery in 1979
British Airways logo from 1982-1997
Concorde and (likely) Queen Elizabeth 2, 1985, credit
British Airways Boeing 737-236
British Airways logo from 1997-present Designed by Newell & Sorell, 1997 (since merged with Interbrand). “The BA ribbon is a distant echo of the Speedbird symbol first used by Imperial Airways in 1932 and then by BOAC.” (Quoted from Logo.)
Photo via The Drum British Airways guidelines The British Airways brand guidelines PDF is available for download here. Other style guide examples here.