The air traffic direction, North Flow or South Flow, is primarily based on airfield and enroute wind and weather conditions. As a safety factor, aircraft arrive and depart into the wind to maximize aerodynamic lift.
Typical North Flow Operations (Figure 1)*:
Click to see a regional depiction of Dulles International operations in North Flow (PDF file)
Typical South Flow Operations (Figure 2)*:
Click to see a regional depiction of Dulles International operations in South Flow (PDF file)
* FAA Procedures for Dulles International (IAD):
- Search by Airport Identification: IAD
- https://www.faa.gov/air_traffic/flight_info/aeronav/procedures/
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