Adding Aircraft to Schedule Searchform.tpl

How can I link my Aircraft to the actual aircraft. I have added names to the dropdown menu, but its still not filtering aircraft. How can i do this?

<div id=“aircrafttab”>

<p>Select Aircraft:</p>

<select id=“equipment” name=“equipment”>

<option value=“”>Select aircraft</option>

<?php

if(!$aircraft_list) {

$aircraft_list = array();

}

foreach($aircraft_list as $aircraft) {

echo ‘<option value="’.$aircraft->name.‘">’.$aircraft->name.‘</option>’;

}

?>

</select>

<input type=“submit” name=“submit” value=“Find Flights” />

</div>