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 these lists, a spaceflight is defined as any journey that surpasses the Kármán line, the FAI-recognized boundary of outer space at an altitude above mean sea level (AMSL). The timeline includes all flights that have reached this altitude, those intended to but did not succeed in doing so, and those planned for the near future.