an><span class="op">(</span><span class="va">flights</span>,</span>
<span>  gain <span class="op">=</span> <span class="va">arr_delay</span> <span class="op">-</span> <span class="va">dep_delay</span>,</span>
<span>  speed <span class="op">=</span> <span class="va">distance</span> <span class="op">/</span> <span class="va">air_time</span> <span class="op">*</span> <span class="fl">60</span></span>
<span><span class="op">)</span></span></code></pre></div>
<p>However, if you just create the column, please spl