this work for me in profile_main.php Departure Board
I put photo in /lib/images/airline/ (ROT.png, etc)
<?php $code = substr($lastbid->code, 0,3); ?>
<td><img src="<?php echo fileurl('/lib/images/airline/'.$code.'.png'); ?>" alt="<?php echo $airline->name;?>" width="70" height="35" /></td>