Originally Posted by
kentauta
I had to call AA a few times in a similar situation. It's really unfortunate that it takes HUCA for AA, the ticketing carrier & also itinerary holder, to assign a seat. I recently booked a AA-marketed JL-oprated flights via a travel agent (AMEX), and assigning a seat was a piece of cake for the travel agent I wonder if it's that many AA agents simply don't know the trick to assign seats for code share flights or don't even have authority to do so.
Following up on this, I was finally able to get seat selection to stick! I had to HUCA (many times), but in the end, what worked is asking one AA agent to cancel my existing seat assignments and then HUCA to ask another AA agent to assign my seats. I'm not sure if the second agent was just more knowledgable than the first agent, or if clearing the existing seat assignment was the necessary step, but hopefully this helps somebody.