This mission aimed to achieve a soft splashdown of both Starship stages. (Super Heavy Booster and Starship upper stage)

Unlike previous missions, this flight wasn't carrying any payload and flew a suborbital trajectory.

The mission was successful with both stages achieving soft splashdown. 

This mission aimed to achieve deeper reentry into the atmosphere than previous missions. 

The success of Flight 4 paves the way for an ambitious goal of catching the Super Heavy Booster using the launch tower’s “chopsticks” in Flight 5. 

This Starship mission is important for NASA’s Artemis program that aims to send astronauts back to the Moon. 

Starship will be used as a Moon lander for the Artemis 3 and Artemis 4 missions. 

One of the key successes of Flight 4 was the demonstration of propellant transfer between Starship stages, which is crucial for future missions. 

SpaceX is developing a smaller thruster engine to aid with the propellant transfer demonstration.