Until 01 April 2024, AF/KLM still credits miles and XP even when booked without their codeshare. I also retained Skypriority benefits. And for certain other Skyteam airlines, there are still residual agreements.

My CZ flight from Londres to Pékin Daxing credited with 2 days to Flying Blue as normal.

Also, I booked my CZ domestic flight using trip.com, prices came down within 2 weeks of travel date. Actually wanted the train, but the times I wanted were sold out, so opted for flying.

However, Beijing Taipei flights are an exception to this rule, and remain stubbornly expensive and empty. But i mentioned earlier, I used my FB miles to redeem at a decent rate.