A feeling of euphoria may also overcome you, a symptom of the brain not receiving enough oxygen. As with the incidence of a fire, the aircraft will make an emergency descent, taking the plane down to an altitude where it will be possible to breathe without the masks. This is normally 10, 000ft or 4,000ft higher than the surrounding terrain. Turbulence is air movement that normally cannot be seen and often occurs unexpectedly. It can be created by a number of different conditions, including atmospheric pressures, jet streams, mountain waves, cold or warm fronts, or thunderstorms.
Turbulence can occur when the sky appears to be clear.
In 1997, about half of the accidents occurred above 30,000 feet. Among these events were incidences of aircraft losing wings and deaths from falling in-flight entertainment screens. The best advise is to keep your seat belt fastened at the appropriate times as outlined earlier.