AS9100 Rev D vs ISO 9001:2015 main differences

Answer:
As with many other specialized QMS requirements AS9100 Rev D takes the entirety of ISO 9001:2015 and simply adds some aerospace specific requirements to it without taking anything away. While there are some small additions to the processes throughout some of the main additions include; keeping the quality management representative, a process for operational risk management, a process for configuration management, processes to ensure product safety, a process to prevent the use of counterfeit parts, validation and control of special processes, and production process verification.
To find out more about the aerospace specific terms that are defined in AS9100 Rev D, and later are defined as these additional processes, see this article: https://advisera.com/9100academy/blog/2017/05/01/five-special-aerospace-terms-in-as9100-rev-d/