Since the early 1960s, air in passenger jets has typically combined re-circulated existing cabin air with air bled off the engines. The air pulled into the engines is cooled and compressed before it is pumped into the the plane. It is this bleed air that Williams' suit claims was contaminated. See how bleed air enters a plane's ventilation system Â».
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An alternative is to palpate the supratrochlear artery (a branch of the internal carotid artery) in the inner canthus of the eye and keep your finger on the pulse. Palpate the facial artery (a branch of the external carotid) along the angle of the mandible on the ipsilateral side. Gently press the facial artery to obliterate the pulse. If the supratrochlear arterial pulse disappears with the facial artery pressure, then internal carotid artery occlusion is present.