Frankfurt (Reuters) – The German train drivers’ union GDL announced a six-day nationwide strike on Monday, confronting Deutsche Bahn with the longest strike in its history, and further industrial action looms over the country’s aviation sector. Labour union Verdi is set to continue wage negotiations with airline group Lufthansa on Tuesday, saying strikes are an option to increase pressure on Germany’s flagship carrier. Below is a list of Lufthansa branches in negotiations, and what could be at stake for passengers: LUFTHANSA GROUND SERVICES: Verdi is demanding a wage increase of 12.5% for the …