| Answer | Crossword Clue |
|---|---|
| HEAVIER | ...-than-air. |
| HEAVIER | ... than air. |
| BIRDS | Heavier-than-air fliers. |
| DIRIGIBLE | It's lighter than air |
| AEROSTAT | Lighter-than-air aircraft |
| AMMONIA | It's lighter than air |
| DIRIGIBLES | Lighter-than-air craft |
| DIRIGIBLE | Lighter-than-air aircraft |
| AERODYNE | Heavier-than-air craft |
| AEROSTAT | Lighter-than-air craft |
| NEON | Gas that's lighter than air |
| AEROSTAT | Any lighter-than-air craft. |
| BALLOONPARK | Place to take off in lighter-than-air craft? |
| CHILLFACTOR | It makes the air feel colder than it actually is |
