| Level | Delay time | Flight delay rate Variation | Flight delay rate | Airport delay rate | Weather | Air control |
| 1 | ≤10 | ≤−9 | ≤20 | ≤20 | ≤20 | ≤20 |
| 2 | 10 - 20 | −9 - 0 | 20 - 40 | 20 - 40 | 20 - 40 | 20 - 40 |
| 3 | 20 - 30 | 0 - 9 | 40 - 60 | 40 - 60 | 40 - 60 | 40 - 60 |
| 4 | 30 - 40 | 9 - 18 | 60 - 80 | 60 - 80 | 60 - 80 | 60 - 80 |
| 5 | ≥40 | ≥18 | ≥80 | ≥80 | ≥80 | ≥80 |