Finn Henriksen

1 Introduction Air travel has developed to be one of the most common ways for long journeys [1-3]. Although one of the safest transport modes, it still poses certain risks to travelers with cardiopulmonary disease [4]. Despite this, there has been debate about the paucity of evidence regarding the effect of air travel on oxygen saturation in the general population [1-5]. The most frequently reported medical emergencies during flights are syncope and respiratory distress [3, 4].