What is Four-Dimensional Trajectory?
Four-Dimensional Trajectory A predicted or managed aircraft flight path defined by latitude, longitude, altitude, and time—core to Trajectory-Based Operations (ICAO Doc 9971).
Source: ICAO Doc 9432, FAA PCG
How is “Four-Dimensional Trajectory” Used in Practice?
Four-Dimensional Trajectory planning improves traffic flow and reduces conflicts in complex airspace.
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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What is Four-Dimensional Trajectory?
A predicted or managed aircraft flight path defined by latitude, longitude, altitude, and time—core to Trajectory-Based Operations (ICAO Doc 9971).
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