an>
<span id="cb16-6"><a href="#cb16-6" aria-hidden="true"></a><span class="kw">head</span>(flights)</span>
<span id="cb16-7"><a href="#cb16-7" aria-hidden="true"></a><span class="co">#    year month day dep_delay arr_delay carrier origin dest air_time distance hour    speed</span></span>
<span id="cb16-8"><a href="#cb16-8" aria-hidden="true"></a><span class="co"># 1: 2014     1   1        14        13      AA    JFK  LAX      359     2475    9 413.6490</span></span>
<span id="cb16-9"><a href="#cb16-9" aria