AMR Corporation operates American Airlines and its subsidiaries, which together operate an extensive domestic and international air travel network. In recent years, AMR has faced financial difficulties, filing for Chapter 11 bankruptcy in 2011. As part of its restructuring, American Airlines and US Airways agreed to a merger in 2013 that would create the world's largest airline. AMR's financial reports indicate liquidity issues, with current liabilities exceeding current assets. Solvency ratios also reflect high debt levels, with most assets financed through debt. Profitability has been low and negative in recent years, as reflected in negative returns on assets and no dividends declared.