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.
The official line regarding flight 77 (a Boeing 757) is that terrorists hijacked it, flew it about the countryside for 40 minutes (during which time, not one of the fighter jets from any of the numerous nearby US Air Force and Air National Guard bases were sent up to investigate) and then crashed it into the Pentagon.