="https://rdrr.io/r/base/sum.html" class="external-link">sum</a></span><span class="op">(</span> <span class="op">(</span><span class="va">arr_delay</span> <span class="op">+</span> <span class="va">dep_delay</span><span class="op">)</span> <span class="op">&lt;</span> <span class="fl">0</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="va">flights</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%&gt;%</a></span> </s