Table 12.

Quarterly environmental efficiency of passenger subsystem with the IEBM model during 2021–2022

Airlines	2021			2022
	Q2	Q3	Q4	Q1	Q2	Q3	Q4
Aeroflot	[0.658, 0.906]	[0.655, 0.908]	[0.714, 0.920]	[0.931, 1.000]	[1.000, 1.000]	[0.999, 1.000]	[1.000, 1.000]
Air China	[0.958, 0.983]	[0.978, 0.988]	[0.994, 1.000]	[1.000, 1.000]	[0.986, 1.000]	[0.987, 0.998]	[0.982, 0.996]
All Nippon	[0.797, 0.840]	[0.782, 0.832]	[0.825, 0.843]	[0.817, 0.825]	[0.811, 0.833]	[0.819, 0.841]	[0.826, 0.849]
Cathay Pacific	[0.992, 1.000]	[0.958, 0.994]	[0.978, 0.997]	[0.919, 1.000]	[0.928, 1.000]	[0.923, 0.997]	[0.931, 0.995]
China Airlines	[0.897, 1.000]	[0.913, 0.926]	[0.907, 1.000]	[0.830, 0.910]	[0.796, 0.998]	[0.766, 1.000]	[0.740, 1.000]
China Eastern	[0.746, 0.997]	[0.710, 0.992]	[0.670, 0.997]	[0.664, 1.000]	[0.683, 0.978]	[0.702, 0.946]	[0.721, 0.955]
China Southern	[0.825, 0.956]	[0.806, 0.965]	[0.785, 0.977]	[0.879, 0.988]	[0.881, 1.000]	[0.882, 0.966]	[0.884, 0.967]
Eva Air	[0.953, 1.000]	[0.763, 0.954]	[0.736, 0.979]	[0.930, 0.985]	[0.916, 0.919]	[0.903, 0.912]	[0.904, 0.909]
Hainan	[0.911, 0.929]	[0.936, 0.948]	[0.954, 1.000]	[0.898, 0.996]	[0.898, 1.000]	[0.904, 0.944]	[0.910, 0.945]
Juneyao	[0.906, 0.980]	[0.919, 0.983]	[0.937, 0.991]	[0.933, 1.000]	[0.928, 1.000]	[0.923, 0.993]	[0.920, 0.987]
KLM Royal Dutch	[0.537, 0.939]	[0.434, 0.940]	[0.834, 0.937]	[0.691, 0.938]	[0.708, 0.907]	[0.728, 0.910]	[0.744, 0.912]
Lufthansa	[0.787, 0.949]	[0.888, 0.954]	[0.960, 1.000]	[0.968, 0.969]	[0.968, 0.972]	[0.961, 0.988]	[0.938, 0.953]
Singapore	[0.963, 1.000]	[0.968, 1.000]	[0.974, 1.000]	[0.784, 0.981]	[0.806, 0.982]	[0.827, 0.974]	[0.847, 0.967]
Spring	[0.909, 0.988]	[0.952, 0.998]	[0.979, 0.998]	[0.878, 1.000]	[0.885, 0.991]	[0.989, 1.000]	[0.989, 1.000]
Mean	[0.860, 0.948]	[0.837, 0.952]	[0.891, 0.958]	[0.871, 0.965]	[0.874, 0.967]	[0.885, 0.956]	[0.885, 0.956]