They are taught to look above and below seats and in lavatories and galleys, all the while watching the ceiling of the cabin to see if gasses are building that would create a flashover fire.

WSJ: Airplane Fires: Dallas-Fort Worth International Airport's Firefighter Training

In a scathing report, he concluded that investigators in the Willingham case had no scientific basis for claiming that the fire was arson, ignored evidence that contradicted their theory, had no comprehension of flashover and fire dynamics, relied on discredited folklore, and failed to eliminate potential accidental or alternative causes of the fire.

NEWYORKER: Trial by Fire

But Hurst concluded that it was a natural product of the dynamics of fire during post-flashover.

NEWYORKER: Trial by Fire