What is a 'partner' in your view? Is it a country interested in investing in KAAN production? Are there any countries with the technology needed to contribute to further KAAN development?
None of the countries that have expressed their interest in the KAAN can contribute to the development of the Burfis AESA radar, the TF-35000 engine, or any critical part of the fighter jet that Turkey is still developing. Being a partner does not necessarily mean that they will be developing the fighter jet since Turkey has already reached many critical, and successful steps towards the journey of reaching mass production. The Tier 1-2-3 of the F-35 program can give you a glimpse of what a partner could be considered in terms of the technology transfer.
Check this out