but the cabin interior is appropriate for onboard fire extinguishers.
fire on plane is bad no doubt but hyping the effects is not a good idea either.
I work in aerospace and I have also experimented with thermite, and I my opinion is that if a thermite charge goes off in the cabin, bar the door, Katie. The aircraft is probably going to go down. Either the cabin interior will ignite, the thermite charge will burn through some flight-critical system, or both.