As part of a long-term strategy for future missions to the Moon and Mars, SpaceX is planning to attempt an in-orbit fuel transfer between two of its Starship spacecraft (Interesting Engineering, Space Policy Online, Astronomy.com). The question will close upon the successful completion of an in-orbit fuel transfer. Whether the Starship spacecraft successfully reenter the atmosphere is immaterial. The transfer must include both methane and oxygen to count, unless SpaceX changes the fuel used to propel Starship.

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NOTE 12 November 2025: Any in-orbit fuel transfer between two Starship spacecraft will count so long as the transfer is completed.