Please see this report.

Apologies, that report is set to private so here's what I responded:

The series first aired on RTBF's La Une from Dec. 5 to Dec. 26, with two episodes airing every week.

• Episode 1 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2666361160668&idschedule=fd80b312c0e430e71cb8ef1bce7778e8
• Episode 2 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2666361028668&idschedule=d668129e940a9082bc90c90b2e815b84
• Episode 3 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2672099150668&idschedule=c616b019509f322b8b6be24c97a21469
• Episode 4 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2672099258668&idschedule=bfbac619da3b7e35fe625c8e6e878df7
• Episode 5 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2680355484668&idschedule=87588e5e4ee0336feb53d23701df2544
• Episode 6 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2680355608668&idschedule=29f84a4a8551fbe3d68f856cd242d857
• Episode 7 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2686866827668&idschedule=7bc1929a02594f6307b63d707fb384f9
• Episode 8 release date - https://www.rtbf.be/tv/guide-tv/detail_le-tour-du-monde-en-80-jours?uid=2686866799668&idschedule=21dcc7e1f972b35de35d3f61526255b2

Thank you for pointing out the true earliest air date. Sorry that I didn't find that it had aired in France first. I appreciate your updating the episode 8 date that was clearly wrong from both perspectives.

@stephenj said:

Sorry that I didn't find that it had aired in France first.

Belgium is an independant country. It is not part of France... LOL...

Thank you for that clarification. I should have looked more carefully at the station origin I suppose.