[parkingrift]

Passenger vehicles account for about 16% of greenhouse gas emissions. Electric power is another 25%. The rest is industry, commercial & residential, agriculture, and other forms of transportation. It is these areas of the economy which will need hydrogen.

You'll probably die of old age before there is even a whisper of a battery powered passenger plane the scale of a 787. But you may live to see a hydrogen powered passenger plane.

[pencilguin]

Once LH2 airframes start being delivered, displacement of kerosene airframes will happen very fast, probably limited mainly by production capacity of synthetic hydrogen. The changeover will certainly have started by 2040.