whatilearned
Read more: https://www.popularmechanics.com/flight/airlines/a15759858/earth-magnetic-field-airport-runways/
TIL airports renumber their runways because the magnetic pole is not fixed, and headings change slightly over time
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TIL that runway numbers correlate to their headings
Edit: spelling
Some airports do this. The small single-strip airports that may be open to the public but are family owned often don’t bother. They have only one runway, and the number on it is an approximation anyway.