I would have to agree with ironbutt and clipped wings.
Aircraft interiors are luxurious tinder-boxes. Read a sobering stat published by British Airways that said, statistically speaking, when I fire starts inside an aircraft you have less than 2 or 3 minutes to extinguish it before it becomes uncontrollable.
If it becomes uncontrollable, you have only 12 minutes to get the aircraft on the ground. If you do not, the aircraft will be lost due to fire.
The Swissair crash makes for frightening bedtime reading. In that case, a cooling fan actually wisked away many of the smoke fumes to a place where they could not be detected by the crew while the fire grew in intensity.