| Clue | Source | Date |
|---|---|---|
| This one relates to military restrictions | Wall Street Journal | 04 Jan 2025 |
| Banned for aircraft | Newsday | 06 Jan 2017 |
| -- zone (restricted airspace) | Premier Sunday | 15 Feb 2015 |
| -- zone (restricted airspace) | ||
| __ zone: restricted air space | ||
| Type of zone |