Eustachian tubes and airplanes.
D000401:Aircraft; D001469:Barotrauma / Q000601:surgery*; D005064:Eustachian Tube / Q000502:physiology*; D006801:Humans; D008876:Middle Ear Ventilation; D009225:Myringoplasty; D014432:Tympanic Membrane / Q000293:injuries*