^
^^
those have everything to do with transport canada requirements for any structures taller than a given height anywhere in the country - they have nothing specifically to do with the muni, operating or not.
even without the muni, you still have air traffic including stars air ambulance and police helicopters, small aircraft movements, fly-overs, off course or emergency flights etc. taking place, sometimes in inclement weather and sometimes in non-daylight hours.
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"If you did not want much, there was plenty." Harper Lee
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