This uses Molecular Nuclear Fusion again. A 50x1cm steam plasma at 4 atmospheres produces 1.2MW of heat. So we enclose a plasma tube, so air is forced along the pipe, heated and expelled – just like a jet engine, with no fuel burn, or CO2 production.
We do have a small engine, which drives drives a fan. To get the plane moving, then we feather the fan blades, and turn off the engine.
We are flying at supersonic speed, off nuclear fusion. For a large jet, we have three plasma tubes, where the combustion chamber is today.
When not running, we turn down the plasma pressure, into a tick-over mode. So no aviation fuel burnt! No CO2.