13/06/2017 4:33 AM AEST | Updated 14/06/2017 1:49 AM AEST

So THAT'S What The Numbers On Airport Runways Mean

You'll never look at one the same way again.

Another great mystery of air travel is solved. 

There’s a fascinating explanation for those giant numbers and letters you see on the ends of airport runways: They provide some very handy direction for pilots, as explained in the video above from Business Insider. 

The numbers are always between 1 and 36, and the difference between the numbers on either end of the same runway is almost always 18. Sometimes, they’re followed by a letter with a meaning all its own, and sometimes, they change based on the earth’s magnetic north. 

Watch above for the riveting rundown.

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