No he's right, Jet-A has plenty of energy but it's not very volatile so unless you've got a very large hot fire it will not sustain itself.

https://www.youtube.com/watch?v=7nL10C7FSbE

It takes a spray nozzle atomizing it for him to actually meaningfully burn it with a blowtorch.

Because fire consumes oxygen (which you have an enormous supply of) that people need to breathe as well as the airframe/wings you need to stay in the air and the landing gear you need to safely get back on the ground.

Not because of jet fuel.