Lufthansa on Tuesday warned of an “urgent” need to overhaul the way the German airline group provides retirement benefits to employees as the low interest rate environment caused its pension deficit to soar. The deficit in Lufthansa’s defined benefit pension scheme reached €10.2bn on March 31, up 41 per cent from the end of 2014, according to the group’s first-quarter earnings report. The airline group is trying to move on after one of its passenger jets crashed last month, [...]