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The magnetic direction that corresponds with the runway centerline extended, not the painted runway number. When cleared to “fly or maintain runway heading,” pilots are expected to fly or maintain the heading that corresponds with the extended centerline of the departure runway. Drift correction must not be applied; e.g., Runway 4, actual magnetic heading of the runway centerline 044, fly 044.
Source FAA Pilot/Controller Glossary · checked 2026-08-25