 of March, ends on the first Sunday of November.
U = unknown. N = no dst.</p>
</dd>
<dt>tzone</dt><dd><p>IANA time zone, as determined by GeoNames webservice.</p>
</dd>
</dl>



<h3>Source</h3>

<p><a href="https://openflights.org/data.html">https://openflights.org/data.html</a>, downloaded 2014-06-27
</p>


<h3>Examples</h3>

<pre><code class='language-R'>airports

if (require("dplyr")) {

airports %&gt;% rename(dest = faa) %&gt;% semi_join(flights)
flights %&gt;% anti_join(airports %&gt;% rename(dest = fa