SpaceX will attempt to transfer propellant from one orbiting starship to another as early as next March, a technical milestone that will pave the way for an uncrewed landing demonstration of a starship on the moon. The in-flight propellant transfer is a crucial step in reaching the Moon and Mars. SpaceX is under a $53.2 million contract with NASA, signed in 2020, to use Starship tankers for in-orbit propellant transfer.