In 1929, the Graf Zeppelin embarked on a round-the-world trip with 20 passengers. The flight was completed in 21 days. In addition to the round-the-world stamp on the back, the postcard has a cancellation from August 10th in Friedrichshafen, Germany and in New York on August 7th.
Unfortunately, it's very difficult to make out the text of the card, but it is addressed to Hedwig Friedheim in Dresden, Germany