👉 Human experiments referred to as "flights" often involved testing new aircraft, such as experimental planes or spacecraft that pushed the limits of existing aviation technology and safety standards, sometimes for the purposes of evaluating performance, durability, or new scientific research. In some cases, these flights were also conducted for human testing, where individuals would serve as test subjects to evaluate the effects of high altitudes or extreme conditions on the human body, like in early astronaut training programs or space travel simulations.