The new Premium Atmos card sounds great, but I am curious how well it will work for those like me, who fly Alaska often, but credit to other programs.

P2 and I have a stash of miles from previous cards and the AMEX-> HA -> AS "loophole, and we would still like to maintain them. (P2 also credits their flights to AS)

Going through the benefits to see if it would still make sense for Year 2+

These are obviously directly tied to Atmos account, and only apply to earning and burning. I guess I will have to book the ticket with my Atmos# in the reservation, and have an agent change it after the booking.
Global Companion Award
Points Sharing
Status Points
Program Points Transfer

These, I assume I will be able to use regardless of FF#, and just might have to prove identity?
Lounge Passes
Exclusive Lounge Bar Program

These ones I assume I won't get (which is fine as a AA Elite, as I will get them anyway)
Free Checked Bag
Preferred Boarding
Same-Day Fee Waiver

These are directly related to spend, so I don't imagine there will be any issues
Global Entry/PreCheck Credit
20% Inflight Rebate
Atmos Rewards Dining

The ones I am not sure about:
Wi-Fi Passes - At first I assumed it would be like the Lounge Passes, but maybe I have to be "registered" on the flight ti use them
Instant Delay Credit - This I assume is tied to the FF# and automated. I doubt there will be anyway to get this without an Atmos number attached.