| Clue | Source | Date |
|---|---|---|
| Wire stalls roughly built. They're stepped round (10) | ||
| They may have lots of steps | New York Times | 11 Jun 2021 |
| They handle flights and landings | Newsday | 08 Sep 2018 |
| Shafts for flights | ||
| Building shafts | ||
| Certain compartments in buildings | ||
| Building features |