Definition
An air traffic management method in which aircraft are sequenced and spaced by assigning specific times to cross fixed points along their route, rather than by assigning distance-based separation. Controllers and automation tools issue speed adjustments and minor route changes so each aircraft arrives at a metering point or runway threshold at its assigned time.
Plain English
Instead of telling aircraft to stay a certain number of miles apart, controllers tell each one when to be at a particular point. The flow is organised by clock times rather than by distance gaps.
Context Anchor
You may see this term in discussions of busy arrival flows, traffic delays, modern air traffic control tools, and airport arrival planning.
Why Pilots Care
Improves runway and airspace efficiency while cutting delays and fuel use.
Analogy
It is like giving each airplane an appointment time at a busy airport, so they do not all show up at the same doorway at once.
Intuition Check
Time-Based Management does not mean the pilot is just watching the flight time more closely. It means the traffic system is managing many aircraft by planned arrival times at key points.
Example Sentence 1
Under time-based management, the controller asked us to slow to 250 knots so we would cross the metering fix at our assigned time.
Example Sentence 2
Pilots adjusted speed to meet their assigned times under the time-based management program.