Concorde sometimes made special flights for demonstrations, air shows (such as the Farnborough, Paris-LeBourget, Oshkosh AirVenture and MAKS air shows) as well as parades and celebrations (for example, of Zurich Airport's anniversary in 1998). The aircraft were also used for private charters (including by the President of Zaire Mobutu Sese Seko on multiple occasions),[324] for advertising companies (including for the firm OKI), for Olympic torch relays (1992 Winter Olympics in Albertville) and for observing solar eclipses, including the solar eclipse of June 30, 1973[2][325][326] and again for the total solar eclipse on August 11, 1999.[327]