Originally Posted by
foxmoth
And Control area
So by ICAO definition, what you describe are not Airways, here they might be called Advisory routes, though I suppose a better definition for you would be "Compulsory Instrument Routings"
Interesting, I get the airway/corridor bit, but I always that a Control Area was airspace around a Control Zone that did not go all the way to the deck, like the second tier on a upside wedding cake.