SN4 is being prepared for a test flight. SN4 has passed tank pressurization tests that show it could withstand the pressures needed to fly to orbit.

SpaceX is started two Starship prototype construction in May, 2020. SN6 and SN7 had construction starts in May. SN5 was started in April.

Elon Musk indicated that SpaceX would build two Starships every week in 2021.