Flying and health, conceptual artwork. Illustration of a businessman holding an empty glass whilst he is loosening his collar. A plane has been superimposed over his head. This could represent a fear of flying due to a phobia or the threat of a terrorist attack. It could also represent the potential health risks involved with flying including deep vein thrombosis and dehydration. It is adviseable that passengers undertake small excercises such as regular stretching of the legs to prevent deep vein thrombosis and drink fluids to prevent dehydration.