J-Man, why are you asking him to ignore evidence?
There are very clear signs as to if a plane has gone supersonic, namely a loud crack and a moisture cloud behind the tail. So we know no commercial jet ever goes faster than 1234 km an hour, (800 miles an hour).
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But then a plane can fly from mexico city to ciaro to beijin and back to mexico city in 49 hours.
The same model of plane can fly from santiago to capetown to aukland to santiago in 51 hours.
The southern route is at no point closer than 10500 km from the northen route. (And don't claim it's NASA magic as it is measured as ground distance in all but two cases but there is a lot of ground between beijing and aukland).
So from the formula for a circle we can estimate the extra travel time of the southern route as 2pi*10500 km giving an extra66 thousand kilometres that the plane is supposed to travel with just two more hours of flight time.
Even if the southern plane went at the speed of sound, it would need 53 hours just to cover that EXTRA DISTANCE ALONE!