| Answer | Crossword Clue |
|---|---|
| orthopter | a type of aircraft propelled with flapping wings |
| orthopters | ORTHOPTER, a type of aircraft propelled with flapping wings |
| orthopteroid | ORTHOPTER, a type of aircraft propelled with flapping wings |
| biplanes | An early type of aircraft with two pairs of wings, one above the other |
| propjet | a type of airplane (a winged aircraft propelled by jet engines or propellers) |
| propjets | PROPJET, a type of airplane (a winged aircraft propelled by jet engines or propellers) |
