nlit sourceCode r">
<code class="sourceCode R"><span><span class="va">by_tailnum</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html" class="external-link">group_by</a></span><span class="op">(</span><span class="va">flights</span>, <span class="va">tailnum</span><span class="op">)</span></span>
<span><span class="va">delay</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://dplyr.tidyverse.org/reference/summarise.html" class=