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01/14/2026

01/14/2026

01/12/2026

Why do airports rename runways?

The Influence of Earth's Magnetic Shifts
Airports around the globe frequently update their runway numbers due to shifts in Earth’s magnetic field. The magnetic north pole migrates approximately 60 kilometers each year, influencing these changes.

Standardized Naming for Global Safety
Runways are designated numbers based on their magnetic bearing towards Earth's North Magnetic Pole, crucial for ensuring pilots land safely and correctly. These numbers appear at both ends of the runway, on various sign panels, and are integral to communications with air traffic control and international aviation databases.

For example, Helsinki Airport’s runway originally had a magnetic bearing close to 145 degrees. Rounded to the nearest ten degrees, this bearing becomes 150. Removing the last digit gives us 15. Since runways can be approached from either direction, we also consider the opposite end, which would be 180 degrees different, yielding 33. Thus, the runway is officially named 15/33. If an airport has parallel runways, they are further distinguished by letters, such as L (left) and R (right).

Renaming Necessitated by Compass Variations
As the magnetic pole moves, it can cause the magnetic bearing of a runway to shift enough to round to a different number. This change necessitates updating the runway’s name according to international aviation guidelines. In 2018, Geneva Airport underwent such a renumbering, which involved replacing around 100 signs and using 150 kilograms of paint to revise the runway markings. Similarly, the Dwight D. Eisenhower National Airport in Wichita, USA, scheduled a renaming for its three runways in 2019, a process involving considerable expense.

Wishing you blue skies, tailwinds, and safe flying! Keep flying safer, flying smarter.
The Sky's The Limit fans
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01/12/2026

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