Great job! Though I can spot two incorrect airport coordinates:

DUR -29.6144 31.1164 Durban King Shaka International Apt

NBS 42.0881 127.5489 Chang Bai Shan

Also, it appears that HHA represents the Changsha airport while CSX represents the city of Changsha itself. ZGC represents the Lanzhou airport while LHW represents the city itself. This might need correction for posterity.

Another thing, why does the tool show flights in Libya at the moment when all civil aviation is banned at this moment?

I eagerly await a further update!