This issue of the UNWTO World Tourism Barometer and the accompanying Statistical Annex presents an analysis of outbound tourism based on international tourism expenditure and departures data for source markets for 2017. Additionally, it updates of the preliminary results for international tourist arrivals and receipts in 2017 reported by destinations around the world included in the January 2018 Advance Release. Furthermore, this issue includes an analysis of airline results and of hospitality markets in 2017.