Route map of the Dutch Airline KLM in 1990, shown as a metro-style World map. Based on <a rel="nofollow" class="external text" href="https://archive.org/details/1990-klm-route-map-poster">a poster produced by KLM in that time</a>
<a href="//commons.wikimedia.org/wiki/User:Babelia" title="User:Babelia">Babelia</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>