I just noticed something very interesting. Once the agent assigned me a seat, I can select all seats excluding their premium economy product (equivalent to PC here). However, I cannot do so on my outbound from LAX-HEL, but I can for my inbound HEL-LAX. All segments are in their O fare class, a $350 dollar ticket still earns 50% base miles! The only difference I could tell is the fare basis (outbound is
OLW4T1S5 and inbound is OLX4T1S5). Both are in their Economy Classic (better than Economy Lite, worse than Economy Flex). I'll wait and see if thing will change once I'm OWE later in the year.
Outbound on AY2, all seats are locked.
Inbound on AY1, all are open other than Economy Comfort