Originally Posted by
javabytes
Present your bag. When the agent says it'll be $25, which they almost certainly will since your AS number is on the reservation, have your card out and say something like "I get one free bag with the credit card, right?"
See what happens. If they say no, you can either just pay it or not check your bag if it's small enough.
Sounds like a plan ... I got an extra data point, forgot that Mrs Huge had taken a flight under similar circumstances with her Delta Platinum Amex - she was shot down in Seattle (where Delta and Alaska are feuding) but got away with it elsewhere.