Definition
A traffic management value used by air traffic control that represents the number of aircraft a sector, facility, or airport can safely and efficiently handle over a given period under current operating conditions. When projected demand approaches or exceeds the OPLT, traffic management initiatives such as ground delays, reroutes, or miles-in-trail spacing may be applied to keep the workload within a manageable level.
Plain English
It is the number of aircraft a controller, sector, or airport can comfortably handle in a set period. If too many flights are headed that way at once, controllers slow them down or reroute some so the system does not get overloaded.
Context Anchor
Seen in FAA abbreviation and NOTAM contraction lists, and in operational messages that describe traffic flow or traffic limits.
Why Pilots Care
Helps anticipate potential delays or restrictions when planning flights into busy airports.
Intuition Check
Do not read “acceptable” as a casual opinion. Here it means a traffic level that the operation can reasonably handle under the current conditions.
Example Sentence 1
Thunderstorms over the arrival corridor pushed projected demand above the center's OPLT, so traffic management issued miles-in-trail restrictions to inbound flights.
Example Sentence 2
Flight planning software flagged the destination airport as operating at OPLT during the planned arrival window.