After several rounds of strikes at Germany's airports, arbitration for private aviation security staff began on 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