When a plane is in trouble, the pilots dump all its its fuel before making an emergency landing. This is controversial; though fuel usually dissipates before reaching ground, it's a dangerous pollutant all the same and sometimes it gets dumped close enough to humans that it puts them at risk.
This 1984 film, of a test of jet fuel formulated to resist igniting, shows why pilots dump it. NASA and the FAA loaded a retired training jet with test dummies, then remote-piloted it to a crash landing in the Mojave desert. It comes down rough but stays in one piece as it plows through earthworks and obstacles. If it were out of gas, chances of everyone surviving would be good. But with a full tank?
Spoiler: the fuel ignites. As one commenter puts it, "proponents of antimisting kerosene did not have a great day."
The test went generally according to plan, and produced a spectacular fireball that required more than an hour to extinguish. The FAA concluded that about one-quarter of the passengers would have survived, that the antimisting kerosene test fuel did not sufficiently reduce the risk of fire, and that several changes to equipment in the passenger compartment of aircraft were needed.
