Just a nitpick - to make anything CO2 neutral, including planes, we need to remove the same amount of CO2 from the atmosphere as had been emitted during construction and usage of that thing (a plane or anything else). This is not happening any time soon.
The better name would be "Green" or "Eco-friendly" flight, because "CO2 zero" or "CO2 neutral" is impossible for us yet.
You are right for now, but co2 neutral is not impossible. Thats the promise of Rivan, see rivan.com
> Rivan’s RNG (renewable natural gas) generator combines 3 core technologies:
1. A calcium-looping DAC system (CO2)
2. An alkaline water electrolyser (H2)
3. A sabatier reactor (CH4)
To produce 99.9% pure synthetic natural gas, which acts as a carbon-neutral drop-in replacement for fossil alternatives.