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1 - Aviation medicine is rooted in the early 18th-century physiological studies of balloonists, some of whom were also physicians.

2 - Cosmic radiation is dangerous, but nobody knows exactly what levels aviation professionals are exposed to.

3 - It recommended international aviation rules be changed to force operators to be more transparent about their choice of routes.

4 - An important consistent trend about commercial aviation is that it is a fiercely competitive and highly volatile industry, in which fortunes shift continuously.

5 - Over the past decade, significant events have impacted U.S. domestic passenger aviation operations