| under what weather conditions | 5 | other |
| more fuel | 3 | other |
| from an operational | 3 | other |
| airplane → be → efficient | 8 |
| airplane → be → more efficient | 5 |
| airplane → be → most efficient | 4 |
| airplane → become → more efficient | 4 |
| negative | neutral | positive |
| 0.016 | 0.299 | 0.685 |
| Raw frequency | 21 |
| Normalized frequency | 0.399 |
| Modifier score | 0.900 |
| Perplexity | 113.014 |