Definition: The term "the contract twenty one pilot" refers to a specific aircraft that has been flown by one pilot for a particular mission or deployment, and may not be flown by anyone else in the same unit. The name "contract twenty one pilot" is used to indicate the type of aircraft that this aircraft represents.<0x0A>The definition of the word is that a contract twenty one pilot represents one specific aircraft, and it has been flown for a particular mission or deployment by only one pilot.