BA does not accept TFU yet either. The only possible way would be to call in to the partner desk and have them book manually using the TFU code which will require a very experienced agent or a supervisor and might be hard to convince them to do, but with a reasonable excuse like, "this is a new airport code not supported in your current web booking engine so you need to enter it manually", you have a good argument for a manual booking. And, do not even attempt this unless you know there is available award space (verified on AA). You should also report the issue so they can schedule their Crackerjack IT team to fix it (don't hold your breath but it may eventually happen).