ESA's new Invictus space plane could be operational in 2031.

ESA's new space plane “Invictus” is one of the next-generation tools for civil and military space missions. The Invictus looks like the Skylon space plane that BAE recently cancelled. The Invictus could be based on technology that was created for Skylon, but the aircraft will have a more capable team working with it. The European Space Agency (ESA) plans to get Invictus airborne and operational at least in 2031. When we think about the Invictus’s role in space missions, we must first look at the cases where the Cold War-era F-4 Phantoms are planned to be used as satellite cargo missions. Those quite fast fighters will climb as high as they can and then launch miniature satellites into orbit. 

The Invictus can also raise similar satellite carriers to the edge of the atmosphere. And then they can launch those satellites far higher than the F-4 or F-15 Eagle. There have been plans to connect auxiliary rocket packs to the F-4 or F-15 that allow them to jump higher before they release the satellite. 

 The Invictus can have rocket-ramjet or more conventional rocket turbojet hybrid systems. The idea in rocket ramjets is that the ramjet engine raises the space plane to the edge of the atmosphere. Then the iris closes the engine face. And then the engine starts to use an internal oxygen source. In rocket turbojets, the system uses normal turbojet engines in atmospheric flight. 

"A US Vought ASM-135 ASAT missile launch on 13 September 1985, which destroyed P78-1" (Wikipedia, Anti-satellite weapon)

Then the system closes the face of the afterburner, and then that system turns the afterburner into a normal rocket. In the simplest engine solution, the aircraft uses turbojets in the atmosphere. When the flight altitude turns high enough, the system turns to use separated rocket engines. The iris at the front of the turbojet is required because the airflow can damage turbine wings. But if developers can install those orbital rocket engines with some other engine type that decreases the weight of the system. 

The staged system, where the aircraft can operate first with turbojets and then turn to ramjet and finally to scramjet, allows it to fly in the atmosphere at a higher speed using atmospheric oxygen. When that space plane jumps out from the atmosphere, it turns to use rocket mode in ramjet engines. 

There is also an idea about high-altitude airships (HAA), or High Altitude platform stations (HAPS), as the satellite launchers. Those airships can rise to altitudes of about 30 kilometers. They can launch bigger satellite carriers than jet fighters. Those platforms can be airships, balloons, or solar-powered aircraft. HAPS can also use things like internal fuel cells. The HAPS can carry a satellite launcher to high altitude and launch it there. 

The idea of aircraft-based satellite launchers is taken from the U.S. military ASAT, Anti-satellite weapon. The F-15 raises that weapon to the highest point of ballistic trajectory and then that system launches the satellite-killer missile. 

The thing in the satellite launchers is that the same systems can also transport anti-satellite (ASAT) systems to orbiters. Satellites are playing a bigger and bigger role in the modern military. Satellites offer reconnaissance information about enemy movements. And there are also killer satellites in space. ASAT systems can take those killer satellites out. So in that case, they play a counterweapon role. But of course, targeting satellites and military communication satellites are good targets for ASAT weapons. 

So, that means anti-satellite weapons will become more important than ever before. The ASAT weapons can also become more vital than ever before because of suspected fractional orbital bombardment systems (FOBS) or EMP weapons that the enemy launches at orbital trajectory. The ASAT system can eliminate those threats. 

https://www.rudebaguette.com/en/2025/07/theyre-back-from-the-dead-cold-war-f-4-phantoms-revived-to-launch-satellites-and-experts-warn-this-is-military-space-2-0/

https://www.space.com/space-exploration/launches-spacecraft/europe-working-to-launch-invictus-hypersonic-space-plane-by-2031-video

https://en.wikipedia.org/wiki/Anti-satellite_weapon

https://en.wikipedia.org/wiki/High-altitude_platform_station