South African Airways has extended the cancellation of all domestic and regional flights to Monday, it said, as a majority of its employees went on strike on Friday. The state airline said it was aiming to operate most of its international flights departing from Johannesburg’s O.R. Tambo International Airport from Sunday. It said inbound flights from London, New York, Washington, Munich, Frankfurt and Hong Kong were set to operate from Monday. SAA, which has not turned a profit since 2011 and is without a permanent CEO, says the strike by unions representing more than half of its workforce will cost it 50 million rand ($3.36 million) per day and threatens its survival.