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Images, PHP, WP/CP | Type: PHPDisplay Featured Image on Listing

How to add featured image to other post types.

ADD TO THEME FUNCTIONS
// This theme uses post thumbnails
add_theme_support( 'post-thumbnails', array( 'plans','listings','news','post' ) );

ON POST-TYPE SPEC
'supports' => array( 'title','editor','excerpt','thumbnail')

ADD TO LISTING
$themeurl = get_template_directory_uri();
$link = get_the_permalink();
if ( has_post_thumbnail() ) {
	echo '<a href="'.$link.'">';
	echo get_the_post_thumbnail( $post->ID, 'thumbnail', array( 
		'alt' => trim(strip_tags( $post->post_title )), 
	));
	echo '</a>';
} else {
	echo '<a href="'.$link.'"><img src=" '.$themeurl.'/images/planblank.png " alt="no image" /></a>';
}