I ended up using this which worked:
<?php
$posts = get_posts(array(
'numberposts' => -1,
'post_type' => 'page',
'meta_key' => 'display_in_carousel',
'meta_value' => '1'
));
if( $posts ): ?>
<?php foreach( $posts as $post ):
setup_postdata( $post )
?>
<?php endforeach; ?>
<?php wp_reset_postdata(); ?>
<?php endif; ?>
