Hyponatremia refers to a low level of sodium in the blood. Hyponatremia may result from excess fluid in the body relative to a normal amount of sodium, or it may be due to a loss of sodium and body fluid. Symptoms are nonspecific and can include: mental changes, headache, nausea and.
A third plane, American Airlines Flight 77, hit the western side of the Pentagon, just outside Washington, D.C. The fourth hijacked plane, United Airlines Flight 93, crashed down in a field in rural Pennsylvania, never reaching its intended target because its crew and passengers fought back against the terrorists.
On 12 February 2009, pilot mistakes caused by fatigue resulted in such a disaster. Continental flight 3407 stalled and plunged into a house five miles north-west of its intended destination in Buffalo New York, killing pilots, crew, all 45 passengers on board and one man on the ground.