The criteria for determining who has achieved human spaceflight vary. The FAI defines spaceflight as any flight over 100 kilometres (62 mi). In the United States, professional, military, and commercial astronauts who travel above an altitude of 80 kilometres (50 mi) are awarded astronaut wings. The majority of people who have flown into space have done so by entering Earth orbit. This list includes persons meeting all three criteria, in separate subdivisions.
