The Global Entry program allows visitors to the US to safe time on arrival at the destination airport. In October and November, there are special events in Germany , simplifying and abbreviating the registration process. Prior to the events, one has to check with German Federal Police. After passport inspection your personal information will be send to Customs and Border Protection (CBP) in the US.
26th October at Frankfurt Airport
2nd to 3rd November at the US Embassy Berlin
5th to 6th November at Düsseldorf Airport
9th to 11th November at Munich Airport