• Altitude – Vertical distance above mean sea level. 
  • Height Vertical distance of a level or point measured from a specific datum, e.g. above aerodrome surface. 
  • Elevation Vertical distance of a fixed object above mean sea level (e.g. aerodrome or obstacle. 
  • Flight Level Surface of constant atmospheric pressure measured from the 1013 hPa datum used for vertical separation by specified pressure intervals (usually 500 or 1000 ft). Flight Level is measured in hundreds of feet. e.g. FL350 = 35 000 ft. 
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