AAT9

The goal of this observational study is to collect clinical information on how safe, and how well the NEXUS Aortic Arch Stent Graft System and the Custom-Made NEXUS DUO™ Aortic Arch Stent Graft System work for the treatment of aortic aneurysms, in the standard-of-care setting. The main question\[s\] it aims to answer are: * Early mortality * Safety outcomes throughout the study * Device failure throughout the study * Procedural and hospitalisation information Participants will be treated per institutional standard of care Follow-up information will be collected through to five years.