Airman's Information Manual
Ask FLYINGWhy Do Runways Get Renumbered?
Every five years, such decisions are based on how much the Earth’s magnetic field changes.
Meg Godlewski![](https://www.flyingmag.com/uploads/2023/06/AdobeStock_320423381-scaled1-e1687961280840.jpeg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
![](https://www.flyingmag.com/uploads/2022/09/Pilot-and-copilot_adobe-stock-rs.jpg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
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