Table 13.

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

Airlines	2021			2022
	Q2	Q3	Q4	Q1	Q2	Q3	Q4
Aeroflot	[0.802, 0.921]	[0.795, 0.926]	[0.898, 1.000]	[0.882, 1.000]	[0.959, 1.000]	[0.944, 0.983]	[0.945, 1.000]
Air China	[0.937, 0.960]	[0.955, 0.966]	[1.000, 1.000]	[0.922, 1.000]	[0.924, 0.935]	[0.926, 0.947]	[0.951, 0.929]
All Nippon	[0.906, 0.915]	[0.918, 0.929]	[0.922, 0.955]	[0.909, 0.928]	[0.910, 1.000]	[0.913, 0.987]	[0.914, 0.977]
Cathay Pacific	[0.659, 0.894]	[0.903, 0.959]	[0.914, 0.969]	[0.916, 0.929]	[0.906, 0.970]	[0.913, 0.940]	[0.918, 0.928]
China Airlines	[0.883, 0.897]	[0.908, 0.943]	[0.936, 1.000]	[0.956, 1.000]	[0.922, 1.000]	[0.891, 0.991]	[0.878, 0.986]
China Eastern	[0.772, 0.987]	[0.746, 0.979]	[0.718, 0.984]	[0.799, 0.991]	[0.810, 1.000]	[0.820, 0.964]	[0.831, 0.964]
China Southern	[0.836, 0.971]	[0.827, 0.973]	[0.836, 0.984]	[0.844, 1.000]	[0.853, 1.000]	[0.861, 0.972]	[0.869, 0.973]
Eva Air	[0.884, 0.967]	[0.925, 0.972]	[0.989, 1.000]	[1.000, 1.000]	[0.999, 1.000]	[0.993, 0.999]	[1.000, 1.000]
Hainan	[0.887, 0.934]	[0.932, 0.932]	[0.956, 1.000]	[0.855, 0.982]	[0.859, 0.980]	[0.867, 0.958]	[0.874, 0.942]
Juneyao	[0.932, 0.975]	[0.920, 0.989]	[0.970, 0.985]	[0.914, 1.000]	[0.943, 0.992]	[0.924, 0.968]	[0.917, 0.955]
KLM Royal Dutch	[0.895, 0.936]	[0.927, 0.963]	[0.964, 1.000]	[0.937, 1.000]	[0.885, 0.922]	[0.857, 0.907]	[0.832, 0.894]
Lufthansa	[0.745, 0.802]	[0.764, 0.868]	[0.784, 1.000]	[0.794, 1.000]	[0.804, 0.818]	[0.770, 0.815]	[0.753, 0.825]
Singapore	[0.809, 0.814]	[0.830, 0.969]	[0.854, 1.000]	[0.730, 0.875]	[0.744, 0.807]	[0.760, 0.786]	[0.767, 0.775]
Spring	[0.929, 0.995]	[0.989, 0.962]	[0.994, 1.000]	[0.894, 1.000]	[0.905, 0.986]	[0.981, 1.000]	[0.988, 1.000]
Mean	[0.856, 0.918]	[0.907, 0.927]	[0.909, 0.991]	[0.883, 0.964]	[0.893, 0.952]	[0.898, 0.933]	[0.902, 0.926]