Here in Puerto Rico we are an FAA facility adjoining a number of ICAO facilities. In the U.S., we had "colored airways" based on L/MF beacons, although they've pretty much passed into history.
As a result, we all assume that ATS Route B520 is to be called "Blue 520". I've heard that's incorrect; it should be called "Bravo 520". I would guess the answer could be found in the 4444, but have been unable to find it. Anyone know the correct answer and reference? Thanks.
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