The best book on the topic. What of course doesn't mean it's perfect.
Very good composition, the content is clear, approachable, illustrated with enough practical examples. I was a bit surprised to find out that the actual Airflow architecture is covered near the end of the book, but finally it appeared not to be an issue.
The book covers a proper intro to Airflow, describes its conceptual elements (like task groups), integrations, deployment options (all the major cloud ones), securing, testing, etc.
What would I improve in this book?
1. I'd add a chapter with architecture advice - how to organize idempotent processing pipelines at scale (esp. data and its split - conceptually Airflow doesn't bother with those and some conventions/best practices have to be put in place).
2. Airflow alternatives - where Airflow shines and which scenarios it is not the best equipped to address (e.g. comparison with NiFi or Luigi)
3. AWS scenario covers manual deployment, not a managed scenario.
Solid 4.5 stars. Recommended.