s="fl">0</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 class="op">&amp;</span> <span class="va">month</span> <span class="op">==</span> <span class="fl">6L</span>,</span>
<span>               <span class="fu">.</span><span class="op">(</span>m_arr <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/mean.html" clas