Filtering CO2 from the atmosphere
The supply of aircraft without oil and the planetary restoration requires CO2 to filter out of the atmosphere and split into carbon and oxygen.
Here is the solution for filtering. The cost is stated as below US $ 100 per tonne. With extremely cheap solar power in sunny deserts and a mass production, there is quite a lot of possibilities for lower prices.
But that would only be the first step. After filtering, the CO2 must still be split into oxygen and carbon. The carbon can then be processed either to any hydrocarbon, to fuel aircraft in the future, or to remove steel and aluminum as a building material.