More misery was heaped on to an embattled U.S. airline last week when a plane toilet overflowed and sewage trickled into the cabin, according to a German newspaper. The incident forced the United Airlines plane to turn back to Frankfurt, Germany, rather than continue on its 12-hour flight to San…#unitedairlines #frankfurt #northsea #scottkirby #boeing #777 #deltaairlines #atlanta #alaskaairlines #737 (Source: Reuters: Health)