[comnetxr]

The question should not be whether this is too costly as compared to jet fuel, but at what carbon price is it cheaper than jet fuel? Once the cost of carbon is at the long term limit, which is equal to the cost of extracting carbon from the atmosphere, then these technologies could be much more cost effective. (But if they aren't, there would be no reason to ban flying, as the carbon price would pay for the extraction of carbon that flying produces.)

By not account for how much jet fuel costs with increasing carbon pricing, and by framing the alternative to allowing climate change as banning flying, it seems like the author has completely missed the story..