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by katbyte 3722 days ago
from wiki, canada:

> Nav Canada manages 12 million aircraft movements a year for 40,000 customers in over 18 million square kilometres, making it the world’s second-largest air navigation service provider (ANSP) by traffic volume

usa:

> In 2006 En Route and Oceanic Services supported 47 million operations in the national airspace system. We are responsible for controlling more than 5,600,000 square miles (15,000,000 km2) of airspace in the U.S. and more than 24,600,000 square miles (64,000,000 km2) of airspace over the oceans.

roughly 1/4 the volume, I'm willing hazard a guess it would scale.