Who were some notable figures that flew around the world to showcase airplane capabilities?

The answer highlights Howard Hughes and Richard Stoddart, although Richard Stoddart is less commonly known in aviation history. Howard Hughes is a prominent figure recognized for his ambitious flights and contributions to aviation. His 1938 flight around the world in a record 91 hours showcased the potential of air travel, significantly promoting the capabilities and technological advancements of aircraft at the time.

Hughes' achievement not only served to demonstrate the speed and efficiency of modern planes but also illustrated the expanding reach of aviation as a global means of transportation. His flights were crucial in generating public interest and proving that long-distance air travel was feasible.

While several other notable figures contributed to aviation history, their associated flights either didn't emphasize the showcase of airplane capabilities or focus primarily on other aspects of aviation, such as military contributions or early flights that didn't have a world circumnavigation element.