"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="va"><a href="https://github.com/hadley/nycflights13" class="external-link">nycflights13</a></span><span class="op">)</span></span>
<span></span>
<span><span class="va">flights</span> <span class="op">=</span> <span class="fu"><a href="https://rdatatable.gitlab.io/data.table/reference/data.table.html" class="external-link">data.table</a></span><span class="op">(</span><span class="va"