In another thread we talked about converting to a durable economy that is not dependent on fossil fuel. Now flexibility on energy and mobility seem to be inverse proportional. In static plants you can use anything that's available. Cars are more limited although there is still a range of possible energy sources (gaz, gaseous, electrical). Aviation however seems to be fully dependent on liquid fuel. Some remarks: Soving this issue seems to be an essential mission and the first to do that has excellent chances for a lead position in the future. So are there devellopments in this direction. Any thoughts?