Which statement best describes how sequencing and spacing affects safety and traffic flow?

• A. It assigns gates to arriving flights.
• B. It schedules lunch breaks for controllers.
• C. It determines the order of fueling for aircraft.
• D. It arranges arrivals and departures in time and space to maintain safe separation.

Answer: (C)

The idea being tested is how controlling the order and spacing of aircraft in time and space keeps safety and traffic flow. When sequencing and spacing are done well, arrivals and departures are arranged so each aircraft maintains the required separation from others, both along its path and in the stacked phases of flight, allowing safe operation and efficient throughput.

The statement that best matches this is the one describing arranging arrivals and departures in time and space to maintain safe separation. It captures both the timing and the spatial positioning necessary to prevent conflicts and keep traffic moving smoothly.

The other options focus on tasks that aren’t about managing air traffic separation and flow: assigning gates handles terminal logistics, scheduling lunch breaks is about staffing, and determining the order of fueling is a ground operation detail.