The term 'Control Tower Concern' refers to the job of a control tower operator, who is responsible for monitoring and directing aircraft in the vicinity of an airport. The two crossword solutions for this term are 'PLANE' (5 letters) and 'Flightpattern' (13 letters). A PLANE is an aircraft that is used for transportation, while a flight pattern is the route taken by an aircraft as it moves from one destination to another. Control tower operators must be familiar with both planes and flight patterns in order to ensure the safety of all aircraft in their area.