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American Airlines, the world's largest carrier, is enjoying strong financial results, but service agents who work for a subsidiary carrier say they aren't sharing in that wealth. A survey of 900 workers at regional carrier Envoy Air found that 27% of those who responded said they must accept food stamps and other public assistance to make ends meet. Other workers say they are forced to buy out-of-date food, borrow from retirement accounts and even sell blood to get by.