NAV CANADA, the country's provider of civil air navigation services, conducted an assessment of the airspace requirements in the vicinity of the Mirabel Airport (CYMX). The assessment concluded that after the permanent closure of the St-Jérome Aerodrome (CSN3) the area excluded from the control zone within 7 nautical miles (NM) north of the Mirabel Airport should be included in the control zone.
The area within 7 NM, north of the Mirabel Airport will be added to the Mirabel Control Zone. 
NOT FOR NAVIGATION
This change will take effect on 20 February 2025 at 0901Z Coordinated Universal Time (UTC).
The appropriate aeronautical publications will be amended.