Additional calls for strikes at the group’s five airlines are possible at any time BERLIN: German flight attendants’ union UFO is calling for a five-hour strike on Sunday at German flag carrier Lufthansa, UFO said on Monday, in an escalating row over workers’ pay. Flight attendants and pursers at Lufthansa’s largest hubs, Frankfurt and Munich, have been called upon to take part in the walkout, which is scheduled from 0400-0900 GMT, UFO deputy chief Daniel Flohr said in a video message released on YouTube. Additional calls for strikes at the group’s five airlines are possible at any time and the union will discuss unlimited walkouts next week, Flohr added. He said UFO was demanding from Lufthansa’s namesake airline a 1.8 percent pay increase over a half-year period. At other airlines of the German group, the union is in conflict over issues including pay as well as part-time work and pension plans, Flohr said.