Okay, with the standard FE map, the distance between Sydney and Santiago (sticking to the same latitude, so underestimating the actual path the plane would take) is roughly 33600 km.
The flight in the video is claimed to have taken 11.5 hours.
This gives a speed of roughly 3000 km/hr.
With the 200 km/hr jet-stream (using the high number they provided), this reduces the planes airspeed to 2800 km/hr, well above the typical cruising speed of 900-1000 km/hr for large jets.
So no, the jet-streams don't help.
Instead of this video being a remedy for the short duration of the flights, it appears to be an attack on the RE and these flights on a RE where he seems to indicate they should be shorter.
Yes, the straight line distance between these 2 cities is roughly 11340 km.
Yes, doing the math this means the plane is travelling at roughly 1000 km/hr. (986 to be more precise).
Yes, the cruising "land" speed of a large jet in a 200 km/hr jetstream should be roughly 1100 km/hr to 1200 km/hr, which is significantly faster than the average speed of the flight.
What the video maker seems to be ignoring is:
- planes don't fly direct routes as the runways are typically never aligned correctly, and they often need to wait for landing and they will fly off the direct route to go along jetstreams and to avoid bad weather
- planes don't start at their cruise speed.
- The jet-streams aren't always at the 200 km/hr (in some places it was only 100 km/hr or less
The first 2 factors mean that from a simple calculation of direct distance and time, you will have a lower average speed than the cruise speed of the aircraft.
So the maker of the video seems to be objecting to a fairly small deviation of no more than a less than 200 km/hr which can easily be explained by the above, while ignoring the much greater deviation of roughly 1800 km/hr that the FE requires.
You might try arguing that they take a more direct route, but that takes them over lots of land that is well know, specifically regions of North America. Now the people on the planes might not be geniuses, but I'm fairly sure they can tell the difference between Antarctica and North America.
This also involves going in the opposite direction to what the planes are observed to do. It also means they don't get the jetstreams.
But just looking at such a route, assuming they went direct, that is roughly 27 000 km, requiring them to fly at roughly 2400 km/hr, well above the plane's max speed.
So that isn't a solution either.
And all this has been pointed out already by plenty of people in the youtube comments.