SpaceX is only getting started launching Falcon Heavy commercial missions, but it already has its eyes on the next prize – launching Starship. Now, we know that it’s hoping to start commercial service for this next-generation, fully reusable rocket by 2021, according to SpaceX Vice President of Commercial Sales Jonathan Hofeller.

Hofeller was speaking at a conference in Indonesia (via SpaceNews), and noted that the private space launch company is currently talking to three different telecom companies about selecting which will be the first mission aboard the new spacecraft. Starship, formerly knowns as ‘BFR’ or ‘Big Falcon Rocket’) is currently in development at two separate SpaceX facilities, one in Texas and one in Florida, in what amounts to an internal company ‘bake-off’ to see which team can delivery the better solution faster. An engineering show-down of this kind is not uncommon among tech companies, and often produces results from both efforts that complement or enhance whatever the final product ends up being, rather than being a ‘winner take all’ scenario.

Starship, once complete, will include a launch system propelled to orbit by a ‘Super Heavy’ booster, with even more lift capacity than the existing Falcon Heavy rocket. It’ll be able to delivery as many as 20 metric tons to geostationary transfer orbit, or over 100 tons to low-Earth orbit. It’s also intended to be the spacecraft that enables SpaceX to achieve its goal of running crewed missions to Mars.

Previously stated target dates for Starship milestones include achieving orbital launches by 2020, though based on this new info those will be test or demonstration missions rather than for paying customers. SpaceX CEO Elon Musk also previously said that the company is looking at 2023 as the earliest target date for providing a Moon circuit space trip to his first paying tourist customer, Japanese entrepreneur Yusaku Maezawa.