Professor Papatheodorou is a prolific academic researcher in areas related to air transport and tourism economics and geography. His work has received wide recognition at an international level. He has about 2200 citations of his work by other scholars in English (based on Google Scholar) and two of his papers were declared as the most downloaded in their year of publication by the respective journals (Annals of Tourism Research, 2001; Journal of Travel Research, 2010). He is the Editor-in-Chief of the Journal of Air Transport Studies and a Resource Editor of Annals of Tourism Research and has reviewed papers for 30 journals. He participates in the Panel of Experts of the United Nations World Tourism Organization (UNWTO).