With conventional jet emissions. We plave a ring of venturi nozzels on the jet exhaust. When the jet has reached cruising altitude we turb ob a water feed.
Water drops are sucked into the jet exhaust – boing off and doing Molecular Nuclear Fusion. So the engine drives the plane at hypersonic speed, from a jet engine only at tick over.
Slashing CO2 emissions from jet trsvel, by a factor of 10. And reducing jet journeys times by 75%! I told Sheffield University about this in 2004.