This hook lets you to add the content below the Related Trip section in single trip page. The content are added in a full width container.

Source

File : /templates/archive-itineraries.php

Example :

function prefix_wp_travel_after_main_content() {
    esc_html_e( 'This is the content added using this hook', 'text-domain' );
}
add_action( 'wp_travel_after_main_content', 'prefix_wp_travel_after_main_content'  );