As of 2019, SpaceX owner Elon Musk is funding and developing a series of Mars-bound cargo flights with the BFR rocket and spaceship system as early as 2022, followed by the first crewed flight to Mars on the next launch window in 2024.[5][6][7] During the first phase, the goal will be to launch several BFRs to transport and assemble a methane/oxygen propellant plant and to build up a base in preparation for an expanded surface presence.[8] A successful colonization would ultimately involve many more economic factors—whether individuals, companies, or governments—to facilitate the growth of the human presence on Mars over many decades.[9][10][11]