British Airways is the official airline of the Wimbledon Championship tennis tournament and was the "official airline and tier one partner of the Olympics and Summer Paralympics 2012". British Airways was also the "official airline of England's bid to host the 2018 Football World Cup". Since inception in 1974, BA aircraft have had a Union Jack pattern painted on their tail fins. In 1997, there was a controversial change from the use of the previous British Airways branding to a new "livery which was primarily intended to reflect the diversity of the locations served by the airline - the so-called "World Pictures". This involved a number of different designs which appeared on the tail fins and elsewhere, although the bodies of all aircraft used company colors consistently; the exception was the Concorde fleet, which would have a new tail fin design based on a stylized Union flag and waving. The ethnic images were supposed to refer to the different countries of the company's route network and hubs (example: Chinese calligraphy, Delftware, etc. “This is said to have caused problems with air traffic control: previously i controllers were able to tell pilots to follow a BA aircraft, but were now more difficult to identify visually.” Prime Minister Margaret Thatcher was reportedly very unhappy with the change. In 1999, the chief executive of British Airways announced that all BA aircraft would return