American Airlines Group Inc on Tuesday said it has written off more than half a billion dollars in revenue stuck in Venezuela because of currency controls. American, the world’s largest airline, said in a regulatory filing it will recognize a $592 million special charge in the just-ended fourth quarter “due to continued lack of repatriations and deterioration of economic conditions in Venezuela.” The South American country’s socialist government had compelled carriers to sell tickets in bolivars but made reconverting the sales into U.S. dollars difficult. Globally, airlines have around $3.7 billion trapped in Venezuela as a result of its 12-year-old currency control system, the International Air Transport Association said in June. American also said on Tuesday it continues to expect a pre-tax margin between 12 percent and 14 percent for the fourth quarter, […]