American Airlines' parent company says it lost $904 million in December -- more than in the first nine months of 2011 combined. Revenue was $2 billion in December, American's first full month operating while under bankruptcy protection. AMR Corp. disclosed the numbers in a filing late Tuesday with a federal bankruptcy court in New York. Company executives are scheduled to meet with employees Wednesday in Fort Worth, Texas, to detail concessions they want from unions under a reorganization plan. Unions expect the company to propose job cuts and either freeze or end American's pension plans. AMR filed for bankruptcy protection on Nov. 29. It lost $884 million in the first nine months of 2011 and about $11 billion since 2001.