Zhang Bo waves to family members and friends after landing at an airport in Chicago, the United States, on June 9, 2019. [Photo/Xinhua]

The Diamond DA42 aircraft which Zhang Bo drove for his flight around the world lands at an airport in Chicago, the United States, on June 9, 2019. [Photo/Xinhua]

Zhang Bo unloads an immersion suit from his plane at an airport in Chicago, the United States, on June 9, 2019. [Photo/Xinhua]