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The same as always: by generating more thrust and lift to overcome drag and gravity. To do this they will no doubt use engines running on kerosene, as they do today.

If you mean kerosene in your question, then rest assured that it won't run out. There's plenty of fuel in the ground to go around for a long, long time, and even if it did one day run out, technological advances in power supply will probably kick in and give aeroplanes a new source of thrust.

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14y ago
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Q: How will airplanes fly when the petrol finishes?
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