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  1. ENR 5.1 Prohibited, Restricted, and Other Areas

  2. Airspace Restrictions | Federal Aviation Administration

  3. Restricted Areas: What You Should Know, And How To Operate

  4. Entering, Exiting and Flying in United States Airspace

  5. Restricted airspace - Wikipedia

  6. Everything You Need to Know About Restricted Areas

  7. How to Operate in Restricted Areas (And Stay Out of Trouble)

  8. Special Use Airspace - CFI Notebook

  9. Airspace Classes Explained (Class A, B, C, D, E, G)