message: Add AA to adopters
diff: | [Roku](https://www.roku.com) | [@timurista](https://github.com/timurista) | Initial work on Cloud engineering service platform. |
  | [SDA SE](https://sda.se) | [@Fox32](https://github.com/Fox32) | Central place for developing and sharing services in our insurance ecosystem. |
  | [H-E-B](https://www.heb.com) | [@german-j-rodriguez](https://github.com/german-j-rodriguez) | Initial work on Engineering Portal service platform. |
  +| [American Airlines](https://www.aa.com) | [@paulpach](https://github.com/paulpach) | Central place for developers to develop and maintain applications |
  