Firefly Aerospace’s orbital launch business combines the operational Alpha small rocket with two larger development programs involving Northrop Grumman: Antares 330 and Eclipse. Alpha returned to flight in March 2026 and is transitioning to a longer Block II configuration. Firefly supplies the new first stage for Antares 330 and is co-developing the two-stage Eclipse, whose first launch is planned no earlier than 2027.
The Texas company also builds lunar landers and orbital spacecraft, with rocket engines, electronics, and composite manufacturing connecting its product lines. A November 2026 engine agreement with AST SpaceMobile extends that manufacturing role to another company’s proposed launcher. Firefly consequently participates in orbital launch as a vehicle operator, a development partner, and a supplier of propulsion hardware and associated intellectual property.
The Company Behind the Rockets
Firefly’s company organization includes engineering, spacecraft production, rocket manufacturing, and testing in central Texas. Jason Kim has served as chief executive since October 2024. The company trades on Nasdaq under the symbol FLY, and its Rocket Ranch in Briggs houses launch-vehicle production and test operations. Co-locating these activities allows manufactured hardware to move into engine and structural testing within the same industrial operation.
The company also produces Blue Ghost lunar landers and Elytra orbital vehicles. Blue Ghost Mission 1 landed on the Moon in March 2025, following its January launch. These spacecraft are distinct from Firefly’s launch vehicles: a lander operates after departure from Earth, and an orbital vehicle maneuvers or carries payloads in space. Alpha, Antares 330, and Eclipse provide the propulsion needed to launch payloads from Earth’s surface into orbit.
Firefly’s second-quarter 2026 results reported revenue of $117.7 million, covering its business rather than Alpha launches alone. The company’s portfolio includes its SciTec defense technology business alongside launch and spacecraft products. Its position within the American commercial launch market spans dedicated small-satellite missions and the development of larger vehicles for government and commercial customers.
Alpha’s Vehicle and Orbital Capabilities
Alpha is a two-stage liquid-propellant rocket designed for dedicated missions in the one-ton payload class. Firefly’s current specifications list 1,030 kilograms to a 300-kilometer low Earth orbit and 630 kilograms to a 500-kilometer sun-synchronous orbit. The latter orbit is arranged to maintain a consistent relationship with the Sun, a useful characteristic for some Earth-observation missions. These performance figures apply to different destinations and flight conditions.
Four Reaver engines power Alpha’s first stage, and one Lightning engine powers the second. Both stages use liquid oxygen and RP-1, a refined kerosene rocket fuel. The engines use a tap-off cycle, taking hot gas from the combustion process to drive the turbine machinery that pumps propellant. Alpha’s airframe and propellant tanks use carbon-fiber composites, combining the vehicle’s structural and cryogenic storage functions in lightweight assemblies.
The current Block II design is 31.7 meters long, with a five-meter-high payload fairing measuring 2.2 meters in diameter. The fairing encloses the spacecraft during atmospheric ascent. Alpha’s upper-stage engine can restart for additional maneuvers after the initial climb toward orbit, a capability demonstrated during the VICTUS NOX mission and again on Flight 7. Mission sequencing can include payload deployment followed by an upper-stage disposal maneuver.
Alpha’s Block II upgrade increases overall length from approximately 97 feet to 104 feet. Firefly is changing the tank configuration to increase burn time, improving thermal protection, and strengthening the composite structures. The redesign also accommodates automated fiber placement, in which machinery lays composite material along controlled paths during production. Firefly identifies manufacturing consistency and production efficiency as purposes of these changes.
The electronics changes consolidate batteries and avionics into systems built by Firefly rather than purchased as separate off-the-shelf units. Avionics encompass the electronic equipment that controls and monitors the vehicle in flight. The company plans to use common hardware across its rockets and spacecraft where applicable. Reaver and Lightning remain the propulsion basis of Alpha, retaining the engine family as the surrounding vehicle configuration changes.
Flight Experience and the Return to Orbit
The VICTUS NOX mission in September 2023 demonstrated Alpha’s role in rapidly assigned launches. After receiving the Space Force’s final launch order and orbit requirements, Firefly completed trajectory updates, payload encapsulation, transport, integration, and fueling within 24 hours. The rocket lifted off at the first available window, 27 hours after the order, and delivered a Millennium Space Systems satellite to its target orbit.
The short call-up period followed earlier vehicle and payload preparation. It concerned the final mission assignment and launch campaign, with the rocket and spacecraft already available for the operation. Firefly also performed an upper-stage restart and targeted reentry during the flight. The demonstration combined a specified response time with an actual satellite deployment, establishing an operational example of the service Firefly markets for time-sensitive government missions.
Alpha Flight 6, launched on April 29, 2025, failed to reach orbit. Firefly’s published mishap account states that the first stage ruptured just after stage separation. The resulting pressure wave damaged the second stage’s nozzle extension and reduced thrust. The upper stage recovered attitude control and climbed to 320 kilometers, but exhausted its propellant before attaining orbital velocity. The flight carried a Lockheed Martin LM 400 technology demonstrator.
The Federal Aviation Administration cleared Alpha to resume launches in August 2025 following the investigation. A separate ground-test event in September damaged the first stage originally assigned to Flight 7. Firefly’s subsequent program update attributed that event to hydrocarbon contamination introduced during integration, which caused a combustion event in an engine. The company incorporated corrective changes into preparations for the replacement flight vehicle.
On March 11, 2026, Alpha Flight 7 reached orbit from Space Launch Complex 2 at Vandenberg Space Force Base in California. It delivered a Lockheed Martin demonstrator and restarted the second-stage engine. Flight 7 was the last mission in the earlier Alpha configuration, but carried selected Block II systems to gain flight experience before introduction of the complete upgrade.
Those systems included Firefly’s new avionics and enhanced thermal protection. The mission linked the return-to-flight campaign to the vehicle’s production transition by flying components intended for the next configuration. In its August 2026 development presentation, Firefly reported Flight 8 in final integration and subsequent vehicles progressing through production. Flight 8 is assigned to introduce the full Block II configuration.
Alpha Customers and Additional Launch Sites
Lockheed Martin and Firefly extended their multi-launch agreement through 2031 in August 2026. The arrangement covers up to 25 dedicated Alpha launches and incorporates the Block II vehicle. It gives a spacecraft manufacturer an established launch framework for individual missions rather than requiring each payload to be placed on a larger shared flight.
Firefly’s mission manifest also includes NASA’s QuickSounder satellite and the three-spacecraft Investigation of Convective Updrafts, or INCUS, mission. The published mission assignments place QuickSounder at Vandenberg and INCUS at Wallops in Virginia. The planned Virginia operation adds an East Coast launch location to Alpha’s existing California site, with site selection tied to mission trajectories and customer requirements.
In September 2026, Firefly and SSC Space announced two launches from Sweden, targeted no earlier than 2028. SSC Space purchased the full payload capacity and can allocate it to Swedish national security customers and commercial rideshare spacecraft. The launches are planned from Esrange Space Center, where work includes Alpha’s integration building, payload processing facilities, control systems, and launch pad.
The Swedish agreement extends Alpha’s customer access through a local spaceport operator. SSC Space controls allocation of the contracted capacity, and Firefly supplies the launch vehicle and associated service. The companies reported completed control, processing, integration, tracking, security, and storage facilities in September, with pad construction continuing. The arrangement establishes a defined overseas operating program for the same Alpha rocket family.
Antares 330 and the Shared First Stage
Firefly’s role in Antares 330 is to develop the new first stage, powered by seven Miranda engines. Northrop Grumman retains its Castor 30XL solid-propellant second stage and MACH avionics. This replaces the first-stage arrangement used on Antares 230+, which made its final flight in August 2023. The revised vehicle combines Firefly’s liquid-propellant booster with Northrop Grumman’s existing upper-stage technology.
Northrop Grumman identifies up to three Antares 330 missions supporting commercial resupply of the International Space Station. The vehicle’s published capability is up to 10,500 kilograms to a low Earth orbit station-transfer trajectory, with a 3.9-meter fairing accommodating Cygnus. Antares 330 is also a transition within the joint development program: its new first stage and other systems are intended to carry forward into Eclipse.
This creates a distinction between the two partnered launchers. Antares 330 preserves a solid upper stage associated with station cargo flights. Eclipse uses a new liquid-propellant upper stage and larger payload accommodation. Firefly’s booster development supports both programs, but their upper stages, payload volumes, and overall performance establish different vehicle configurations and mission offerings.
Eclipse’s Larger Two-Stage Architecture
Eclipse is designed as a 59-meter rocket with a 5.4-meter outer-diameter fairing. The joint March 2026 vehicle datasheet specifies 16,300 kilograms to a 200-kilometer low Earth orbit, 3,200 kilograms to geosynchronous transfer orbit, and 2,300 kilograms on a translunar injection. These are published design performance figures for separate mission destinations, with more energy required for transfer trajectories beyond low orbit.
The Eclipse first stage uses seven Miranda engines, and its second stage uses one Vira engine. Both burn liquid oxygen and RP-1 through tap-off propulsion systems derived from Firefly’s smaller engine families. The datasheet gives first-stage vacuum thrust of 7,161 kilonewtons and upper-stage vacuum thrust of 890 kilonewtons. Carbon-composite structures and tanks form the vehicle’s airframe, expanding the manufacturing approach already used for Alpha.
Firefly’s Eclipse program description identifies propulsive first-stage landing and return to the launch site as design objectives. The rocket is being developed for station resupply, commercial spacecraft, science payloads, and national security missions. Initial operations are planned from the Mid-Atlantic Regional Spaceport in Virginia. Its larger fairing provides accommodation for spacecraft that cannot fit within Alpha’s much narrower payload enclosure.
During 2026, the partners advanced engines, tanks, and supporting structures through ground testing. Firefly’s August development presentation reported a 226-second Miranda firing and completion of forward-bay structural testing. It also described first-stage tank tests and pressure-vessel qualification. These activities test the hardware that carries loads and stores propellant during ascent, alongside the engines that supply thrust.
Engine Supply for AST SpaceMobile
On November 6, 2026, Firefly announced an AST SpaceMobile propulsion agreement valued at more than $1.3 billion. Firefly will supply 27 Miranda and nine Vira engines for AST’s first three rockets, provide an engine-manufacturing license, and contribute engineering support over three years. Firefly retains ownership of the engine intellectual property and continues serving other launch customers.
The agreement connects the Miranda and Vira development work to a separate proposed launch system through hardware deliveries and licensed production. Firefly reported more than 175 Miranda hot-fire tests totaling over 4,200 seconds by the announcement. Its own vehicle roadmap continues with Alpha Block II and the partnered larger rockets, including Eclipse’s announced first-flight target of no earlier than 2027.
As an Amazon Associate we earn from qualifying purchases.
Useful Books Available on Amazon
