Am I reading this right? It seems like the mileage requirement is doubling (unless I have made a mistake here). These seem like Delta rates now.
Now, Japan to USA/Europe is 125,000 business and 160,000 first
After April 2021 it will be 210,000 business and 315,000 first
Based on this:
Roundtrip Osaka to Incheon, Zone 2: 50,000 and 75,000
Then roundtrip Incheon to Europe or USA (west coast) Zone 8: 160,000 and 240,000