In a statement Mr Nall's family said the trial had been "harrowing" and their grief was "immense".
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There was also a substance thought to be cleaning fluid found in Mr Nall's eyes, the prosecution said.
Det Sgt Andrew Paine from Cheshire Police said their investigation showed Mr Nall "did nothing to provoke the horrific attacks".
"This is not like an everyday trip, " said pilot Lee Nall Jr.
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Judge Edwards described Mr Nall, also an alcoholic, as "vulnerable".
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