September 18, 2016. Four participants changed into flight uniforms at an airport in Aichi, Japan. A Japanese venture firm has allowed paying customers to experience what it feels like to travel in space. The fledgling astronauts boarded a small jet and flew over the Sea of Japan at an altitude of almost 9,000 meters. The training flight was organized by PD Aerospace, a company based in Nagoya, Aichi Prefecture.