I booked a zrh-bkk-syd-bkk-zrh award in F.
I already completed the outbound in Oct 11, the return portion is during easter.
I just discovered that I have been downgraded to J for the syd-bkk sector due to an equipment swap from 340 to 747. Ana still shows F availability for that segment.
What are my chances getting US to reinstate me to F for that sector, given that my ticket is partially used.