Basic requirements of CDM project:

1. A clear baseline can be determined.

1. Measurable greenhouse gas emission reduction.

3. Specific financial and/or technical obstacles to implementation (additionality)

Aspects to consider:

1. fuel conversion or substitution: looking for low-carbon fuel.

2. Save energy or reduce emissions by improving efficiency, including replacing good aircraft with high-efficiency and low-emission aircraft.

Try to use solar energy when flying (it seems that there is no such technology at present, so it is impossible to have similar projects).

What can be written in this respect is really limited, and there is no corresponding methodology at all. It is too difficult to do CDM because of its technical feasibility.