This hook is an alternative to the ‘wp_travel_before_single_itinerary’ hook which allows you to add your custom text above the featured image in single trip page.

Source

File : /templates/content-single-itineraries.php

Example :

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