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 loaded a retired jet with crash-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 survival would be good. But with a full tank?
Spoiler: the fuel ignites.
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