SpaceX is taking the steps necessary to begin test flying the orbital-class version of its Starship spacecraft, with new documents filed by the company (via Teslarati) with the FCC seeking necessary permissions for it to communicate with the prototype while it’s in flight.

The company filed documents with the U.S. regulatory agency this week in advance of the flight, which lists a max altitude of 74,000 feet, which is a far cry from Earth orbit but still a much greater distance versus the 500 or so feet achieved by the squat Starhopper demonstration and test vehicle that SpaceX has been actively operating in preparation for Starship.

SpaceX CEO Elon Musk confirmed that prep was underway via tweet. Musk has previously said that he hoped to follow the Starhopper’s most recent and final successful test quickly with tests of the full-scale vehicle. Like with that low-altitude test, SpaceX will aim to launch and land the Starhopper, with touch down planned just a short distance away.

Assembly and construction of the Starship prototype looks to be well underway, and Musk recently teased a Starship update event for September 28, which is likely when we’ll see this prototype assembled and ready to go ahead of its planned October first test flight window.

Starship is the next generation of SpaceX spacecraft, designed for maximum reusability, and with the aim of creating one vehicle that can serve the needs of current and future customers, eventually replacing both Falcon 9 and Falcon Heavy. Starship is also a key ingredient in Musk’s ambitious plan to reach and establish a continuing human presence on Mars.