All right, so here we go. First off, Professor Dave is as dishonest as they come.
Yes, 250 mph jet streams exist, despite what he says. Source? Here:
https://web.archive.org/web/2008072...onomy/solarsystem/jupiter_sidebar_000209.html
Planes can also fly pretty fast, up to 800mph for a passenger plane utilizing a jet stream. Source? Here:
https://aviation.stackexchange.com/...ommercial-passenger-aircraft-top-speed-record
Notice how Professor Dave draws that loooong arc from South America to Australia and says it's ridiculous to go that route. He also asserts that planes ARE going that route, and therefore they must be flying over a globe because that route only makes sense on a globe. BUT FLAT EARTHERS DENY THAT PLANES ARE FLYING THAT ROUTE IN THE FIRST PLACE. On a flat earth, straight line vectors are the fastest routes between points, unless there are jet streams that can be utilized to facilitate flight paths.
This great video discusses a path that's similar to the one that Professor Dave cleverly obfuscates in his video:
Now, I personally fact checked that first flight path, Buenas Aires, Argentina to Cape Town, Africa. I did so by looking up tickets for that route. Here's what we end up with.
Buenas Aires, BR -> Cape Town, SA
34 hours 50 minutes
2 stopovers:
Sao Paulo 1 h 15
Addis Ababa 12 h 30
Subtract out the layover times and you get about 21 hours and change for this flight, too long.
BUT NOTICE THE SECOND LAYOVER. Addis Ababa.... in ETHIOPIA. Now get a globe and tell me how that makes sense.