BERLIN (Reuters) – Strikes will ground flights on Thursday at some of Germany’s biggest airports, including the global hub Frankfurt, in the latest wave of industrial action by transport workers to hit Europe’s largest economy, officials said on Wednesday. The labour union Verdi has called for strikes by security staff at airports across the country as it raises pressure on the government in wage talks. “The security checkpoints outside the transit area will be closed. It is therefore not possible to board flights from Frankfurt,” airport operator Fraport said in a statement. All passengers wh…