 The company aimed to have two aircraft operative in June 1984 , and be fully operational with 35 to 40 employees and four aircraft by 1985 , when all @-@ year oil drilling would start in the Norwegian Sea . Use of aircraft for oil spill reduction was at the time established in the United Kingdom , and Norsk Forurensningskontroll aimed to create a similar preparedness for Norway in cooperation with the Norwegian Pollution Control Authority . The cost of the four aircraft was stipulated to approximately NOK 35 million . Operation started in May 1984 with an aircraft on dry lease from Widerøe ( LN @-@ BNS ) , which was also used as system development platform . The airline stated that they hoped to have 30 to 50 operations per year . 
