This isn't "nickel and dimes"
Flights must fall within the eligible flight number range below, and your flight must be marketed and operated by Finnair.
This has been very well stated across the forum, the exception is not the rule.
See differing language from AS marketed but not operated flights:
To qualify, flights must be in the range of eligible flight numbers listed above, and must be marketed and operated by Alaska Airlines, or marketed by Alaska Airlines and operated by the airlines noted above.