1929 Graf Zeppelin Interrupted American Flight

I have a question please. The 1929 Interrupted American Flight of the Graf Zeppelin. The flight was completed August 1-4 and the mail was back stamped New York August 5. There is no listing for mail from the US on the return flight. Is that because it was the beginning of the Round the World Flight? August 8 - September 1.

It depends on what country you are from. The so called "Interrupted" flight Left Friedrichshafen shortly after dark on May 16, 1929 but only got so far as Cuers, France because of engine trouble. Repairs were made and the Zeppelin returned to Friedrichshafen. During this shortened flight mail was dropped over Basel, Barcelona and Cuers and those drop covers are very scarce. There were also 100 unofficial covers carried outside of the mail on the return flight from Cuers to Friedrichshafen on May 23 and these are also scarce but there are well made forgeries floating around so if you want to buy one of these you would really want to have it expertised before you pay your money. Then on July 27 there was a test flight - covers are fairly common and they do not have a cachet. On July 28 there was another test flight, this time to the Rhineland and covers were dropped at Stuttgart, Pforzheim, Durkheim, Koblenz, Trier, Speyer, Kaiserslautern, Durmersheim, Landau, POirmasens, Freudenstadt, and Saulgau. These are not rare either. Then from August 1, 1929 to August 4, the Zeppelin finally completed its interrupted flight to the US on what is called the "America" flight. This flight delivered new mail plus the old mail that was originally on the "Interrupted flight" from back in May so you will see many different postmarks on this mail. It was all back stamped at New York City on August 5. During this flight there was drop mail over Basel, Ponta Delgada, and Seaside Park, New Jersey. The mail to New York is fairly common and the drop mail is scarce with plenty of forgeries floating around. Finally, there was the so called "Round the World" flight. Most Americans tend to consider this flight as starting in Lakehurst, New Jersey on August 8 and ending back at Lakehurst on August 29. The Germans on the other hand generally consider the Lakehurst to Friedrichshafen leg to simply be the return flight of the August 1 "America" flight, and that the "Round the World" flight started in Friedrichshafen and ended in Friedrichshafen. So, it depends on which starting/ending point you want to go with on the "round the World" flight as to whether the Lakehurst to Friedrichshafen leg was simply the return of the "America" flight or the start of the "Round the World" flight.