Border Message— Thanks to differences in logging regulations, the messages actually turned out to be visible from the air

[Explain](https://www.explainxkcd.com/wiki/index.php/3236:_Border_Message).

[Xkcd #3236](https://xkcd.com/3236), licensed under a [Creative Commons Attribution-NonCommercial 2.5 License](https://creativecommons.org/licenses/by-nc/2.5/).