Originally Posted by Recyclops

My interpretation is that if you are a current HON with requal period 2020/2021, then if you collect 600k miles in 2020, you'll get status until Feb 2024, per your third case ("If you qualify for HON in 2020/2021 (special rule)...").

If you are not yet HON and you collect 600k HON miles in 2020, then I agree that you would get HON until Feb 2023, because that's how the old system worked. (It's as if your qualification period was 2019/2020.)