For the purpose of these lists, a spaceflight is defined as any flight that crosses the Kármán line, the FAI-recognized edge of space, which is  above mean sea level (AMSL). The timeline contains all flights which have crossed the edge of space, were intended to do so but failed, or are planned in the near future.
For the purpose of these lists, a spaceflight is considered any journey that surpasses the Kármán line, the FAI-recognized boundary of outer space, which is above mean sea level (AMSL). The timeline includes all flights that have crossed the edge of space, were intended to do so but did not succeed, or are scheduled for the near future.