Although British International Helicopter Services Ltd. ( including its time under the Veritair banner ) has suffered no accidents since its inception in May 2000 , the following events were experienced by its predecessors : A British Airways Helicopters Sikorsky S-61N G-BEON crashed into the southern Celtic Sea en route from Penzance to St. Mary 's Airport in low visibility . The crash killed 20 of the 26 passengers and crew ( see 1983 British Airways Sikorsky S-61 crash ) , making it the worst UK Helicopter accident until the 1986 British International Helicopters Chinook crash
1986 British International Helicopters Chinook crash
1986 British International Helicopters Chinook crash
British International Helicopters