Despite the successful commercial flight last month, there is still work to be done.

Last month, Jeff Bezos’ Amazon-derived spaceflight company, Blue Origin, made history as the second commercial spaceflight company to launch a manned flight into space. As the flight had Bezos himself as one of its passengers, it was a major event and a major milestone for both the company itself and the pursuit of commercial spaceflight as an industry.

With the excitement of the event long-since faded, Blue Origin’s operations have returned to business as usual. In spite of successfully launching a manned New Shepard rocket, there is still plenty of testing to be done on the rocket’s viability as a means of travel and delivery. To that end, earlier today, Blue Origin conducted its fourth overall test flight of the New Shepard, launching a fresh module from their base in West Texas.

The purpose of this test flight was to determine the safety of carrying numerous cargo items. Besides 18 varied customer research payloads, the New Shepard’s cargo included a NASA lunar lander technology demonstration, as well as an art piece painted by Ghanaian artist Amoako Boafo titled “Suborbital Tryptych.”

Over the course of the 10-minute mission, the NS-17 capsule reached 347,430 feet in altitude, before safely returning to the Earth’s surface, its contents no worse for wear. While this particular model of New Shepard is intended for cargo rather than people, every successful test flight teaches the engineers more about the process and what modifications need to be made. With this latest successful flight, Blue Origin has reaffirmed their goal to launch another manned flight before the end of 2021.