Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining more than one drug may kill more tumor cells. Radiation therapy uses high-energy x-rays to damage tumor cells. AE-941 may help shrink or slow the growth of non-small cell lung cancer cells. It is not yet known if combination chemotherapy plus radiation therapy is more effective with or without AE-941 for non-small cell lung cancer. This randomized phase III trial is studying combination chemotherapy and radiation therapy given with AE-941 to see how well they work compared to combination chemotherapy and radiation therapy alone in treating patients with stage III non-small cell lung cancer that cannot be removed by surgery