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The outer surface, shown on Ottawa Macdonald-Cartier International Airport Zoning Plan No. 06-006 94-128, Sheets 1 to 4, 6 to 20 and 22 to 24, dated February 20, 1996, is an imaginary surface established at a constant elevation that is 45.000 m above the assigned elevation of the airport reference points, except that, where that surface is less than 9.000 m above the surface of the ground, the outer surface is located at 9.000 m above the surface of the ground. The limit of the outer surface is described as follows:
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