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The U.S. Navy made jet fuel from seawater in 2013 for $6 per gallon in 2013 dollars. They flew an f18 with it.

[The average cost of Sustainable Aviation Fuel (SAF) in the US is currently around $8.81 per gallon. This is significantly higher than the average cost of traditional JetA fuel, which is around $6.18 per gallon.]-according to RMI

A $3 increase in jet fuel cost is not a deal breaker not for $3000+ one way tickets.

The original Concorde got 15.8 passenger miles per gallon. It’s 3450 miles JFK to London. That’s 218 gallons per passenger. The cost difference at $3 would be $655 per ticket. Those dates are going to be in the $10000 range for first class and $3000 for business class. They won’t blink about using SAF they need special fuel anyways for the heat and altitude points. Plus synthetic fuels are upwards of 20% denser meaning more range out of the same sized tanks.