That flight was, as far as I can tell, the last flight of the Graf Zeppelin, the last of the great airships. The British were tracking the flight on radar and monitoring the communications the whole time. According to one story I read, at one point the airship gave an incorrect position report. The British had to bite their tongues to keep from correcting the Germans. IIRC, I read this story in a book I bought in England titled "Most Secret War" by Dr. R. V. Jones (considered by many as the father of electronic countermeasures), a great read.