| Clue | Source | Date |
|---|---|---|
| One of a space shuttle's pair | USA Today | 24 Feb 2018 |
| One of a space shuttle's pair | ||
| Triangular feature of the Concorde | USA Today | 18 Sep 2017 |
| Triangular feature of the Concorde | ||
| Swept-back feature of some aircraft | ||
| Triangular stabilizer on an aircraft | ||
| Jet design |