Low density altitude means that

1. The air density is high, which causes a drop in airplane performance compared to the case of high density altitude
2. The air density is low, which causes a drop in airplane performance compared to the case of high density altitude
3. The air density is high - ie the aircraft's performance will be much worse than in the case of high density altitude
4. ✓The air density is high - ie the aircraft's performance will be better than in the case of high density altitudeCorrect answer

Explanation

Density altitude is the pressure altitude corrected for non-standard temperature.

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