FlyerTalk Forums - Unable to book seats on codeshare flights

After Amadeus moved to a single PNR for code share flights there are issues in selecting seats for such flights unless a marketing airline paid to have access to the operating airline seatmap and show that in Amadeus.

This only applies when both airlines are in Amadeus, for example, the issue shall be in place for AY op by BA/ CX and vv.
The pair AY op by AA shall work fine as AA uses Sabre and you shall be OK to select seats via AA, however, you need to get a record locator for the AA operating booking first of course.

Amadeus has a very simple command to select seats when seat map is not available (or when there is no contract rather with Amadeus to store seatmaps). It is very simple and called 'seat wish'. Here is the documentation from Amadeus:

https://servicehub.amadeus.com/c/por...ke-a-seat-wish

The posts in this thread indicate that not all agents are trained to use this option. It shall normally be the marketing airline who you ask to make a seat wish.