Zhang Bo, 57, kicked off his second flight around the world from Chicago on April 2 in a Diamond DA42 aircraft.

Zhang plans to fly to Canada, then the Arctic Circle, cross the Davis Strait into Greenland and Iceland and go further into Europe. He will subsequently turn toward Turkey, Kazakhstan and Russia before passing through China. He will then go through northeast China, Russia, the Bering Strait and fly back to Chicago. The trip will pass through 23 countries and is scheduled to take two months.

Zhang made history in 2016 when he made his first flight around the world in a propeller-driven aircraft. Compared to the first flight, Zhang faces bigger challenges this time, since the aircraft he is flying is piston-propelled and has no pressure cabin, which means it has limited endurance and flying altitude.