n class="st">"JFK"</span> <span class="op">&amp;</span> <span class="va">month</span> <span class="op">==</span> <span class="fl">6L</span>, <span class="fu"><a href="https://rdrr.io/r/base/length.html" class="external-link">length</a></span><span class="op">(</span><span class="va">dest</span><span class="op">)</span><span class="op">]</span></span>
<span><span class="va">flights</span><span class="op">[</span><span class="va">origin</span> <span class="op">==</span> <span class="st">"JFK"</span> <span cla