Those streetlights do not represent how the sun actually sets. Notice that the streetlights get smaller as they get further away, but the sun stays the same size. There is solar flare in many images, though, so you have to use a solar filter to ensure that you are actually showing reality.
Actually, there are direct Johannesburg to Sydney flights that are impossible on a flat earth. The distance is twice what it would take on a globe and longer than the actual fuel capacity of the airplanes, and would take twice as long as the flights actually do. Literally, the flight you are saying only makes sense on a flat earth is impossible on a flat earth.
And CONNECTIONS are not fuel stops. 90% of the world's population lives in the northern hemsiphere, and there are not a lot of direct flights. So, people wanting to go from southern hemisphere locations to other southern hemisphere locations simply do not have a lot of options. But the fact that several of those flights DO exist, actually means a flat earth is impossible.
Please actually do your research. You are just repeating without fact checking.