How are specific aircraft assigned to flight routes? As I understand, each plane is not kept on the same route (i.e. JFK-BNA-JFK-BNA-JFK-BNA,etc.) but is usually rotated around the system (i.e. JFK-BNA-MIA-ATL-IAH-LAS-DFW-SEA). With that degree of complexity, how can airlines be sure of having an aircraft available to complete all their flight routes?
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