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However , in rare cases , the hijackers have flown the aircraft themselves and used them in suicide attacks ; most notably in the September 11 attacks , and in several cases , planes have been hijacked by the official pilot or co-pilot .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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