In a ballot of flight attendant union members, more than 96% voted in favour of going on strike in the ongoing wage dispute with the German airline Lufthansa, the Ufo union said on Wednesday, but a strike date is not to be set until later. It comes after ground staff at the national carrier are set to go on strike from Wednesday evening, with security staff at Germany’s Frankfurt and Hamburg airports set to join the action on Thursday. They are represented by a different trade union. Ufo head Joachim Vázquez Bürger stressed that unionized flight attendants as well as the entire Lufthansa cabin…