Question: Was United Airlines blameless in worst crash in history?, Answer:Yes, Description of United Airlines: Airline in the United States, Fact1: The Tenerife Airport disaster is the deadliest crash in aviation history., Fact2: The Tenerife Airport disaster involved a Boeing plane and a Pan Am plane., Fact3: Pan Am airlines competed with United Airlines and other US companies., Fact4: Boeing is an American multinational corporation that designs and sells airplanes, rockets, satellites,and missiles.
Step1: Which aviation accident is considered the worst in aviation history?, Step2: Is United Airlines excluded from #1?, Wikipedia page for step 1: Aviation accidents and incidents, Wikipedia page for step 2: , not_definitive_answer: False, incorrect_answer: False