I have an AA Admirals Club membership through the Citi Executive AAdvantage card. I also no longer have an Amex Platinum card, as I cancelled that soon after redeeming my airline credit with them after they got rid of AA/US club access. By canceling my Amex Platinum card, I no longer have unlimited access to Alaska Airlines Board Rooms through Priority Pass Select.
For a long list of reasons, I recently found myself unexpectedly flying from DFW to SEA on AA and then SEA to SFO on Alaska Airlines instead of flying nonstop from DFW to SFO on AA. In Seattle, there’s no Admirals Club, so I thought I’d be out of luck for lounge access, but I figured that there might be a small chance that I could get into the Alaska Airlines Board Room through my Admirals Club membership since AA and AS are pretty buddy buddy. Turns out, this is true: there are certain circumstances where you can access an Alaska Airlines Board Room by virtue of having an Admirals Club membership.
The key thing that you need is a flight marketed by and operated by American Airlines/US Airways. If you have a same day ticket/boarding pass on a flight operated and marketed by AA/US, then you can access the Alaska Airlines Board Rooms at Seattle (SEA), Portland (PDX), or Anchorage (ANC). The AA/US flight can be either the inbound or the outbound flight at any of these airports, and it’s even possible that the boarding pass doesn’t even need to involve one of these airports provided that it’s same-day (it’s not specified in the rules, but YMMV with the lounge agents).
Domestic lounges generally aren’t anything special, but the Alaska Airlines Board Rooms generally have a marginally better food selection than most domestic lounges. They have pancake machines in the morning for breakfast, and there’s usually a hot soup later in the day. I also find AS employees to be friendlier than most airline employees, but maybe that’s my Pacific Northwest bias coming through.