OZ is moving to ICN T2 later this year and all things indicate a quick integration with KE. However, I still think OZ will stay *A or at least we can use UA miles on OZ until late 2026, 2 years from when the merger was confirmed. The blackout date can be found on the website:
https://flyasiana.com/C/KR/EN/contents/mileage-tickets
Mileage deduction table, and find peak season. For 2026:

International Flights
(departing from Americas)
2026.2.20~2026.2.21
2026.5.14 ~ 2026.5.31
2026.6.1~2026.6.27
2026.7.31~2026.8.1
2026.8.7~2026.8.8
2026.9.26~2026.9.27
2026.10.3~2026.10.4
2026.12.10~2026.12.26

International Flights
(departing from non-Americas locations)
2026.1.1 ~ 2026.1.4
2026.2.13 ~ 2026.2.22
2026.2.27 ~ 2026.3.2
2026.5.1 ~ 2026.5.5
2026.7.24 ~ 2026.7.31
2026.8.1~2026.8.16
2026.9.23 ~ 2026.9.27
2026.10.2 ~ 2026.10.5
2026.10.8 ~ 2026.10.11
2026.12.25 ~ 2026.12.27

Domestic Flight
2026.1.1
2026.2.14 ~ 2026.2.19
2026.2.23 ~ 2026.3.2
2026.4.30 ~ 2026.5.6
2026.5.25 ~ 2026.5.26
2026.7.26 ~ 2026.8.22
2026.9.23 ~ 2026.9.28
2026.10.5 ~ 2026.10.6
2026.10.8
2026.10.12
2026.12.24 ~ 2026.12.25
2026.12.31