“…The main forces explaining tourism flows, namely, distance and population, can be incorporated into a gravity model and may be accompanied by other economic variables traditionally believed to influence patterns of tourism, such as the exchange rate, gross domestic product (GDP), and oil prices, together with environmental factors such as air quality. However, in spite of their proven suitability for the analysis of tourism demand, until very recently little use has been made of gravity models in this area (Massidda & Etzo, ; Morley, Rosselló, & Santana‐Gallego, ; Santana‐Gallego, Ledesma‐Rodríguez, & Pérez‐Rodríguez, ).…”