Airline passenger miles from 1948 to 2014. Data from <a rel="nofollow" class="external text" href="http://airlines.org/data/annual-results-u-s-airlines-2/">Airlines for America</a>
<a href="//commons.wikimedia.org/wiki/User:Delphi234" title="User:Delphi234">Delphi234</a>
2016-04-04
<span class="int-own-work" lang="en">Own work</span>