Airflow 3 Plugins Airflow 3 plugins let you embed FastAPI apps, React UIs, middleware, macros, operator buttons, and custom timetables directly into the Airflow process. No sidecar, no extra server. CRITICAL : Plugin components (fastapi apps, react apps, external views) require Airflow 3.1+ . NEVER import , , or use / — these are Airflow 2 patterns and will not work in Airflow 3. If existing code uses them, rewrite the entire registration block using FastAPI. Security : FastAPI plugin endpoints are not automatically protected by Airflow auth. If your endpoints need to be private, implement au…