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Guessing from where You are at, that Liner that is flying South over the Sun has come over the Pole, from the Pacific Orient.
When I first moved up here we lived in Sudbury, which is north of the Great Lakes entirely... there were almost no planes to be seen, that far north.
Routes' by Transport Canada and U.S.
FAA, or the ATA and ICAO. But for the Polar and Pacific Zones, the Traffic is so spread out that now most Pilots just put in a 'Great Circle' or Direct Flight, and the ATC Computers give them a Departure Time that keeps them Separated. Over the Poles, and Pacific Ocean, there is very little Radar Coverage
for Commercial Flights (Military has Radar Satellites) and so you are 'on your own', and the Big liners have systems that Transmit
to each other Location so each Pilot can 'See and Avoid'. I've never Flown in a Jet out of Sight of Land, and I WILL NOT do that anyway in a Plane with fewer than 4
Engines (being 'old school', and Knowing Why that was the 'rule')
Interesting that only the computers keep them seperate...
As for the 'separation' of Air Traffic, while the computers (Autopilot) usually "Fly" the Plane,
Separation is Insured by Each One
Flaying a 'Route' at a Certain Speed and Altitude, put in as a 'Flight Plan'. These are Integrated by the 'Traffic Computers', and the Pilot is given a Takeoff Time. Once in the Air, all he has to do is Fly that Plan (or watch the Plane do so)
and everybody has Separation. Most people don't know this, but the Entire 'Air Traffic Control' system is predicated on Any or ALL Planes
losing All Contact with 'Traffic Control', and each Flight continues
on its Route, without Conflict. While this is so Highly Unlikely due to the Redundant Communications
(a Big Liner may have up to 10 or More Radio/Satellite Comms Systems,
(and an Air Band Hand-Held Radio under the Seat)) it Remains the basic Principal that Each Plane is Self-Sufficient for Guidance.
I'd love to live in a place that rarely gets below freezing.