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NORTH ATLANTIC HIGH LEVEL AIRSPACE (NAT HLA)
That volume of airspace between FL 285 and FL 420 within the Oceanic Control Areas of Bodo Oceanic, Gander Oceanic, New York Oceanic East, Reykjavik, Santa Maria, and Shanwick, excluding the Shannon and Brest Ocean Transition Areas.
Listed in the Pilot/Controller Glossary as a cross-reference to NORTH ATLANTIC HIGH LEVEL AIRSPACE (NAT HLA), whose text is shown above.
Source FAA Pilot/Controller Glossary · checked 2026-08-25