Holiday Extras Holiday Extras is for travel add-ons - with airport hotels, airport parking, airport lounges, airports by rail and coach, and holiday insurance as its core offerings. Arrangements for 6.8 million travelers are made every year, with over 90% of these bookings coming from our website. Customer technology, fantastic products, unbeatable prices and hassle-free travel are the focus for Holiday Extras. We can help you to integrate all Holiday Extras Products to your website through API.