| Answer | Crossword Clue |
|---|---|
| DELTA | Shape of plane wings. |
| AILERONS | Movable parts of plane wings. |
| DEICING | Ridding plane wings of sleet, etc. |
| biplane | a plane with two sets of wings |
| biplanes | BIPLANE, a plane with two sets of wings |
| wings | A pilot's certificate of ability to fly a plane, indicated by a badge representing a pair of wings |
