WP Travel gets tour extras array list.

Source

File: /inc/helpers.php
Used by: /inc/helpers.php

Parameters
$itineraries_array, $args

Example:

function prefix_wp_travel_tour_extras_array( $itineraries_array, $args ) {
    $itineraries_array[‘ID’] = ‘SLUG’;
    return $itineraries_array;
}
add_filter( 'wp_travel_tour_extras_array', 'prefix_wp_travel_tour_extras_array', 12, 2 );