Originally Posted by
alanw
I called AA and got a super helpful person after about a 2-minute wait. She said there was something "odd" about the PNR but didn't elaborate. She was able to see the Y+ cabin and assign me seats without any problem. Later I asked her to remove my IB number and add my BA number but this she was unable to do (though she tried a couple of times). This is pretty much par for the course when you buy tickets from IB.
If it's an IB-issued ticket, which it appears to be in this case, you'd want to change the FFN on their system, not on AA's. If you can't make the change on IB's terrible website, try looking up the IB PNR on the 'manage my booking' section of either AY's website or RJ's website; sometimes they work better for such things. Also, as an aside, the standard fare code for premium economy is W, not Y+.