SpaceX needs to build Starships as often as Boeing builds 737s - Ars Technica

"if they want to enable regular flights between Earth and Mars"

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This is the best summary I could come up with:

This is the vehicle that, with plenty of permutations and upgrades, Musk says will ferry cargo and people across the Solar System to build a settlement on Mars, making humanity a multi-planetary species and achieving the billionaire's long-standing dream.

On December 20, the Starship's upper stage slated for the next test flight completed a test-firing of its Raptor engines at the Starbase launch site on the Texas Gulf Coast.

With those milestones complete, ground teams rolled the booster back to its hangar for final preflight checks and reconfigurations.

SpaceX could be weeks away from having both vehicles ready to fly, but the company hasn't released an update on lessons learned from the previous Starship test flight in November.

That flight was largely successful, with apparently flawless performance from the 33 engines on the Super Heavy booster during launch.

The Federal Aviation Administration then needs to approve SpaceX's investigation into the last Starship flight before issuing a new commercial launch license.

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Hopefully with better quality.