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ATRX
Techstars '24Huntsville, US · Founded 2021 · 2 employees on LinkedIn · 1 known investors
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ATRX develops reusable space planes that launch from conventional runways using air-breathing propulsion technology, targeting rapid and low-cost access to space compared to traditional vertical-launch rockets.
Also known as ATRX
Investors · 1
How we know: the Techstars portfolio · open dataset · Top 3000 Accelerator Startups (no YC) 2026-08 · Not right? Tell us
Company profile
researched Sep 2026ATRX, based in Huntsville, Alabama, is developing reusable space planes intended to take off from conventional runways, fly to low Earth orbit, and land again on a runway. The company's stated premise is that existing launch systems rely on vertically launched, staged rockets that require complex ground equipment, expend significant portions of the vehicle, and are restricted to a small number of dedicated launch sites, and that runway-based operation would instead allow use of thousands of existing airports, lower operating costs, higher operating tempo and launch-on-demand capability.
The enabling technology is a propulsion module built around an Air Turbo Rocket (ATR), an air-breathing engine combining turbojet and rocket motor concepts that operates from standstill to Mach 5. According to the company, the ATR consumes roughly 25% of the propellant of a rocket of similar thrust and produces about twice the thrust of a comparably sized afterburning turbojet, which is intended to allow the vehicle to reach orbital speed without staging while carrying wings and landing gear. Prototype engines have undergone hot fire testing, including a test using oxygen and hydrogen; the company states the ATR can also run on propellant combinations such as LOx/RP-1 and LOx/methane.
Alongside the spaceplane, ATRX is developing point-to-point hypersonic vehicles described as capable of traveling up to 5,000 miles in under an hour, and is working on ATR-powered unmanned aircraft systems for defense applications.
Founding story
ATRX was founded by alumni of Virgin Galactic and Virgin Orbit and is led by co-founder and CEO Felix Bustos III, who has more than 15 years of aerospace leadership experience in senior roles with the U.S. Air Force, Lockheed Martin Skunk Works, Virgin Galactic and deep-tech startups, and served as a U.S. military officer. Other named leaders include President John Bergmans and CTO Dr. John Bossard; Dr. Kirk Christensen is also cited as an ATR specialist at the company.
Business model
ATRX is a development-stage aerospace vehicle and propulsion company. It is building its own Air Turbo Rocket engine and spaceplane vehicle, with an intended service model of launch and transportation to orbit rather than one-time vehicle sales, and pursues partnerships that apply its engine to third-party airframes for defense-oriented high-speed unmanned aircraft.
Traction
ATRX has completed multiple prototype tests of its Air Turbo Rocket, including hot fire testing, graduated from the Techstars Space 2024 accelerator, and entered a joint development agreement with Cummings Aerospace in February 2025.
Latest developments
In February 2025, ATRX and Cummings Aerospace announced an agreement to jointly develop affordable supersonic and hypersonic unmanned aircraft systems by integrating ATRX's high-speed turbo-rocket onto a new Hellhound variant, with subsonic and supersonic flight testing planned next. ATRX's CEO framed the partnership as simplifying and de-risking flight testing of its ATR engines ahead of spaceplane development.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
ATRX is an early-stage entrant positioning runway-launched, air-breathing spaceplanes as an alternative to the vertical-launch, staged rockets that have dominated space access for more than 65 years. Company leadership cites demand from more than 50,000 mostly commercial satellites projected to require launch in coming years.
ATRX's approach centers on horizontal runway takeoff and landing with a fully reusable, single-stage vehicle, in contrast to vertically launched, staged rockets. Its Air Turbo Rocket combines high specific impulse with high thrust across the subsonic-to-Mach 5 range, which the company projects will yield lower operating costs and aircraft-like logistics. The company states it employs leading ATR subject matter experts.
Technology
The core technology is the Air Turbo Rocket, an air-breathing propulsion system combining turbojet and rocket motor concepts that operates from standstill to Mach 5 at the edge of space. It is claimed to consume about 25% of the propellant of a similar-thrust rocket and deliver about twice the thrust of a similarly sized afterburning turbojet, enabling a winged vehicle with landing gear to reach orbital velocity without staging. Prototype hot fire tests have been conducted using oxygen and hydrogen, with the engine also designed to run on LOx/RP-1 and LOx/methane.
Go-to-market
The company pursues industry partnerships to accelerate and de-risk flight testing, exemplified by its agreement with Cummings Aerospace to fly ATR engines on a flight-proven Hellhound airframe, and positions its technology toward U.S. defense customers as well as commercial orbital transportation to planned private space stations.
Commercial satellite operators needing launch to Very Low Earth Orbit, Low Earth Orbit and other orbits; passengers and payloads bound for planned private space stations such as those of Axiom Space, Sierra Space, Orbital Assembly and Nanoracks; and U.S. military and allied defense customers for high-speed unmanned aircraft and national security space access.
Geography
Headquartered in Huntsville, Alabama, United States, where management has stated an intention to draw on the local space-focused workforce for hypersonic and spaceplane manufacturing.
History
The company has been developing Air Turbo Rocket technology including engine hot fire tests of a prototype, and stated plans to conduct supersonic flight testing of ATR-powered UAVs in 2022. It completed the Techstars Space 2024 accelerator program. In February 2025 it signed a development agreement with Huntsville-based Cummings Aerospace to integrate its turbo-rocket onto a variant of the Hellhound unmanned aircraft.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Related companies · 3
Companies working in the same space as ATRX.
Timeline · 2
launches, deals, and filingsATRX and Cummings Aerospace signed an agreement to collaborate on high-speed unmanned aircraft systems, integrating ATRX's Air Turbo Rocket engine onto a variant of Cummings Aerospace's 3D-printed Hellhound airframe, with plans to begin subsonic and supersonic flight testing.
ATRX is a graduate of the Techstars Space 2024 accelerator program.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
▸Research sources · 8
primary sources listed
- ATRXatrx.space · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does ATRX do?
- ATRX is developing reusable, runway-launched space planes powered by its Air Turbo Rocket air-breathing propulsion system.
- Who are ATRX's investors?
- ATRX's investors include Techstars.
- Where is ATRX headquartered?
- ATRX is headquartered in Huntsville, US.