that is not normal

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United Airlines Flight Grounded After Passengers Watched Jet Fuel Pour Out Of Wing

Being a passenger on a plane generally requires a good deal of faith in the laws of physics and in the experts who build and operate these jets. But every once in a while, a lay person will see something — like, say, jet fuel leaking out of the wing and onto the tarmac — and that faith can be shaken. [More]