Table 7.
Overall quarterly environmental efficiency of the IEBM model during 2018–2020
| Airlines | 2018 | 2019 | 2020 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 | |
| Aeroflot | 0.915 | 0.928 | 1.000 | 0.894 | 0.876 | 0.915 | 1.000 | 0.911 | 0.824 | 0.628 | 1.000 | 0.925 |
| Air China | 0.984 | 1.000 | 1.000 | 1.000 | 0.970 | 1.000 | 1.000 | 0.963 | 0.817 | 1.000 | 1.000 | 0.983 |
| All Nippon | 0.956 | 1.000 | 0.988 | 1.000 | 0.902 | 0.958 | 1.000 | 1.000 | 0.866 | 0.949 | 0.906 | 1.000 |
| Cathay Pacific | 0.997 | 1.000 | 1.000 | 0.998 | 1.000 | 1.000 | 0.989 | 1.000 | 1.000 | 1.000 | 1.000 | 0.956 |
| China Airlines | 1.000 | 0.963 | 0.991 | 0.963 | 1.000 | 0.985 | 1.000 | 0.985 | 1.000 | 1.000 | 1.000 | 0.940 |
| China Eastern | 0.999 | 1.000 | 1.000 | 0.962 | 0.998 | 0.981 | 1.000 | 0.986 | 0.807 | 0.838 | 0.886 | 0.891 |
| China Southern | 0.982 | 0.964 | 1.000 | 0.937 | 0.988 | 0.951 | 1.000 | 1.000 | 0.986 | 0.964 | 1.000 | 0.896 |
| Eva Air | 1.000 | 0.943 | 0.977 | 0.941 | 1.000 | 1.000 | 0.930 | 0.873 | 1.000 | 1.000 | 0.989 | 1.000 |
| Hainan | 1.000 | 1.000 | 1.00 | 0.977 | 1.000 | 1.000 | 1.000 | 0.949 | 0.925 | 0.898 | 0.964 | 1.000 |
| Juneyao | 1.000 | 1.000 | 1.000 | 0.976 | 0.983 | 0.991 | 0.983 | 0.989 | 0.846 | 0.925 | 1.000 | 1.000 |
| KLM Royal Dutch | 1.000 | 0.988 | 1.000 | 1.000 | 1.000 | 0.953 | 0.992 | 1.000 | 0.893 | 1.000 | 0.811 | 0.948 |
| Lufthansa | 0.980 | 0.953 | 1.000 | 1.000 | 0.906 | 0.955 | 0.946 | 0.996 | 0.872 | 1.000 | 0.884 | 0.946 |
| Singapore | 1.000 | 0.995 | 1.000 | 1.000 | 0.975 | 0.965 | 1.000 | 1.000 | 0.859 | 1.000 | 1.000 | 1.000 |
| Spring | 0.964 | 0.973 | 0.972 | 0.930 | 0.995 | 0.989 | 1.000 | 0.947 | 0.824 | 0.907 | 1.000 | 0.977 |
| Min | 0.915 | 0.928 | 0.972 | 0.894 | 0.876 | 0.915 | 0.930 | 0.873 | 0.807 | 0.628 | 0.811 | 0.891 |
| Mean | 0.984 | 0.979 | 0.995 | 0.970 | 0.971 | 0.974 | 0.989 | 0.971 | 0.894 | 0.936 | 0.960 | 0.962 |
| Std | 0.024 | 0.024 | 0.009 | 0.033 | 0.041 | 0.025 | 0.021 | 0.038 | 0.071 | 0.099 | 0.060 | 0.037 |