Well, Finnair lifetime status is based on number of tier points earned not number of miles flown. So if you spent extraordinary amounts of money on Finnair marketed Finnair metal flights then you would accrue based on what you paid.

On that note I should say that BA is also in the running here, given that they do tier points based on spend as well, with lifetime status based in tier not distance.

Other than JL are there any options for general cobranded credit card spend (not spend on the airline)? And at what star level does JL provide lifetime ow diamond?

There’s a Qantas lifetime platinum/owe now but the qualification is pretty wild, 75000 SC ie 5xLTG

BA lifetime requirements have obvs changed with the new club

I would consider AA to effectively have "lifetime" status via spend.. You just need to charge enough on the credit card each year.
JL 6 star is JMB diamond.

what is enough for the AA option per year for diamond?

There is no AA diamond.
Better off asking the AA forum if you have questions about their status.

sorry I meant Emerald not diamond. Stupid names tbh 😂

To qualify for AAdvantage Platinum Pro (oneworld Emerald) based solely on annual credit card spend, a U.S.-based member has essentially three options:

1. Spend $105,000 (annually) on the Citi® / AAdvantage® Executive World Elite Mastercard® (annual fee $595)
2. Spend $110,000 (annually) on the AAdvantage® Aviator® World Elite Silver Mastercard® (annual fee $199. Not open to new applicants; I'm unclear whether you can still product change)
3. Spend $125,000 (annually) on any other U.S.-based cards (annual fee starting at $0 for the American Airlines AAdvantage® MileUp® Card)

The above represent consumer-focused cards and not business cards.