| Answer | Crossword Clue |
|---|---|
| aeroplanes | AEROPLANE, a flying machine |
| aeroplane | a flying machine |
| ornithopter | a birdlike archaic flying machine |
| ornithopters | ORNITHOPTER, a birdlike archaic flying machine |
| centrifugal | flying from the centre / a centrifugal machine or a drum in such a machine |
| helicopter | a flying machine sustained by rotating blades revolving on a vertical axis above the machine / to travel by helicopter |
