Definition
An air traffic management system and methodology used by the FAA to sequence and meter aircraft to a constraint point — typically an airport, fix, or arrival gate — by assigning each aircraft a precise scheduled time of arrival rather than relying on distance-based spacing. Controllers use the system's time assignments to issue speed adjustments, vectors, or path stretches so the traffic flow arrives in an orderly stream that matches the capacity available at the constraint point.
Plain English
A computer tool air traffic control uses to give each arriving aircraft a target time to cross a certain point, so planes arrive in a smooth, evenly spaced line instead of bunching up.
Context Anchor
You may hear or be affected by TBFM during arrivals to busy airports, along busy routes, or when controllers are spacing aircraft for traffic flow.
Derivation
The name describes the method: managing the flow of traffic by assigning times rather than by spacing aircraft using miles. Replacing distance-based spacing with time-based scheduling lets ATC plan further ahead and absorb delays earlier in the flight, often at higher altitudes where it costs less fuel.
Why Pilots Care
It reduces unnecessary holding, fuel burn, and delays by spacing arrivals more precisely even when winds vary.
Intuition Check
TBFM is not cockpit equipment and it is not a clearance by itself; it is a controller tool used behind the scenes to manage timing and spacing.
Example Sentence 1
Center assigned us a speed of Mach .78 for TBFM metering into the Atlanta arrival.
Example Sentence 2
TBFM allowed the arrival stream to continue without vectoring during the evening rush.