After several rounds of strikes at Germany’s airports, arbitration for private aviation security staff was set to begin Friday at a secret location. Former Bremen state councillor Hans-Henning Lühr was tasked with reconciling the differing positions of the trade union Verdi and the the employers’ association BDLS. The parties have initially set themselves a deadline of midnight (2200 GMT) on Sunday. Verdi has undertaken not to call for any further work stoppages by the approximately 25,000 employees of the security service providers until the end of the arbitration process. According to Verdi …