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Originally Posted by RSD
Yup they already exist, what I mean is that they will be used more often by then.
At the moment airlines are using it for landing and stuff.
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Landings are done in "approach paths" wich change regurarly due to sound regulations over crowded area, etc....
There are no so called "virtual tunnels", flight plans are made from VOR to VOR or DME (beacons) although most routes always have the same flight plan.