Nice: I hadn't heard of the Luanda-Sao Paolo flight before. I shall add it to my list of direct southern hemisphere flights (74+ per week last time I checked).
74+ southern hemisphere flights per week? How do you check and are you able to send me a list please?
This was correct as of two years ago:
Johannesburg - Perth - Johannesburg
South African Airways
SA280/281 (SAA280/281)
Departs Johannesburg every day at 21.10
Departs Perth every day at 23.50
Sydney - Johannesburg - Sydney
Qantas
QF63/64 (QFA63/64)
Departs Sydney every day at 10.50
Departs Johannesburg every day at 19.10 (usually)
Johannesburg - Sao Paolo - Johannesburg
South African Airways
SA222/223 (SAA222/223)
Departs Johannesburg every day at 11.10 (sometimes more than one flight per day, also departing 21.35)
Departs Sao Paolo every day at 18.00 (ditto, with extra flight departing 23.35)
Auckland - Santiago - Auckland
LATAM Airlines
LA800/801
Departs Auckland every day at 18.10
Departs Santiago every day at 00.55
Sydney - Santiago - Sydney
Qantas
QF27/28
Departs Sydney Sunday, Tuesday, Wednesday, Friday at 12.30
Departs Santiago Sunday, Tuesday, Wednesday, Friday at 14.30
Mauritius - Perth - Mauritius
Air Mauritius
MK440/441
Departs Mauritius Tuesday and Saturday at 22.40
Departs Perth Wednesday and Sunday at 13.05
Auckland - Buenos Aires - Auckland
Air New Zealand
NZ30/31
Departs Auckland Sunday, Tuesday, Friday at 20.05
Departs Buenos Aires Sunday, Tuesday, Friday at 23.59
Luanda - Sao Paolo - Luanda
TAAG Angola Airlines
DT747/746
Departs Luanda every day except Tuesday and Thursday
Departs Sao Paolo every day except Wednesday and Friday
>>>>
So I make that 84 flights every week, and more on occasion.
There may be differences in departure times on certain days, or other flights I'm not aware of. Corrections and additions welcome.
>>>>
There are also other flights which fly to/from the southern hemisphere which may represent difficulties for any flat model, but work out fine on a sphere, such as:
Singapore-Johannesburg
Singapore-Mauritius
Mauritius-Hong Kong
Mauritius-Chengdu
Mauritius-Ghuangzhou
Mauritius-Shanghai
Hong Kong-Johannesburg
And then later on this year there's another transpolar circumnavigation flight, which will pass over both poles. Would be interesting to see which route it will take on any proposed flat earth map:
https://www.overthepoles2018.com/>>>>
For easy flight finding, I recommend either Skyscanner or Kiwi. In Skyscanner you can enter something like 'Country X' to 'Everywhere' (direct only) and see what comes up. Or Kiwi is good, because you can draw radius circles around, for example, South America, and pretty easily see where all the direct flights go - or, again, use countries/regions.
Other flight finding tools are available.
Cheers.