Actually you can fly on the Finnair Leisure product on a xONEx ... if you want to.

We flew AY2707 HEL-RHO last year and it was all fine... certainly better than QF domestic Y. But then what isn't?

Having said that you may nto get any miles or status credits for the flight - I know with QF if you read the fin print AY flights over AY2000 or so are explicitly barred from any earnings, so only really useful if you want to go there rather than as a miles run (maybe AA is different though but I doubt it...)