AIRALERT
| Date | Clue |
|---|---|
| 2021-02-07 | Noise heard during the London Blitz |
| 2020-06-05 | Warning during the Battle of Britain |
| 2003-06-07 | Sortie signal |
| 1999-09-19 | Signal to pilots: 2 wds. |
| Date | Clue |
|---|---|
| 2021-02-07 | Noise heard during the London Blitz |
| 2020-06-05 | Warning during the Battle of Britain |
| 2003-06-07 | Sortie signal |
| 1999-09-19 | Signal to pilots: 2 wds. |