The closure of 12 Norwegian airports and disruptions at the country's main airport, Oslo Gardermoen, over a strike by civil aviation employees added further woes Tuesday to airlines under pressure over record-high fuel prices, according to dpa. The absence of 400 striking civil aviation employees has forced airport closures due to insufficient staff to respond to possible emergencies or fires. SAS Norway expressed concern over the labour conflict that disrupted travel plans for thousands of customers who usually use airports that serve cities like Bergen and Stavanger that were now closed. Some 330 flights were cancelled Tuesday by carriers SAS Norway, Norwegian and Wideroe, impacting some 31,000 passengers. The cancellations have also hurt bottom lines with SAS Norway estimated to lose 2.5 million dollars per day. Oslo's Gardermoen airport remained open but some 8,000 passengers were impacted by cancelled flights Tuesday, airport officials said. Among the airports closed Tuesday was Sola that serves the west coast city of Stavanger which usually has some 11,000 passengers per day and is a centre for the key oil and gas industry. The Norwegian postal services has used trucks to cope with its deliveries of mail and packages but said that trucks could not fully replace air freight, online business site E24 said. The civil aviation authority, Avinor, and unions have not held any meetings since mediation efforts failed early Friday. Avinor spokesman Ove Narvesen said, "We can not say anything about when such contact will be re-established." "Avinor has the means to end the strike," Stein Erik Syrstad, spokesman for the trade union confederation LO Stat that organizes the government-hired employees, told Norwegian news agency NTB. Passengers were advised to consult websites operated by the respective airlines over cancellations and if possible look into alternative means of travel.