| Clue | Source | Date |
|---|---|---|
| Airborne emission from ground up to arrival (6,5) | ||
| Stream of condensation in an aeroplane's wake (6,5) | Puzzler | 21 Dec 2024 |
| ____s are seen as possibly the largest contribution from aviation to climate change | The Times Specialist Sunday | 04 Aug 2024 |
| Aircraft's emission (6,5) |