Which two positions in the terminal environment are referred to as "Tower positions"?

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In the terminal environment, the term "Tower positions" specifically refers to roles involved in managing aircraft movements on the ground and in the air within the vicinity of the airport. Ground control is responsible for directing aircraft on the taxiways and ensuring safe movement while they are not airborne. Local control, also known as tower control, handles the takeoff and landing of aircraft, guiding them as they enter and exit the airport’s airspace.

These two positions work together to ensure safe and efficient operations in the terminal airspace. By effectively managing both ground and local operations, controllers can prevent conflicts and maintain the flow of air traffic in busy airport environments. This operational structure is essential for maintaining safety and efficiency in aviation operations.

The other options involve roles that are important but do not fit the definition of "Tower positions." Clearance delivery deals with the initial clearance of aircraft before they start their journey, and flight data provides important flight information but does not engage in direct control of aircraft movements within the terminal environment.