How do I display child post types in the parent post type template

Question

After some digging I found the answer!

Hopefully this helps some other people!

EDIT

Improved Answer!

<?php
$args = array( 'post_parent' => get_the_ID(), 'post_type' => 'airports', 'posts_per_page' => -1 );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
?>

<h2><?php the_title(); ?></h2>
<a href="https://wordpress.stackexchange.com/questions/222748/<?php the_permalink(); ?>">
    <button><?php _e('View', 'text_domain'); ?></button>
</a>

<?php endwhile;  wp_reset_postdata(); ?>