Table 8.

Quarterly environmental efficiency of passenger subsystem with the IEBM model during 2018–2020

Airlines	2018				2019				2020
	Q1	Q2	Q3	Q4	Q1	Q2	Q3	Q4	Q1	Q2	Q3	Q4
Aeroflot	0.820	0.859	0.939	0.757	0.812	0.885	0.982	0.816	0.758	0.538	0.828	0.615
Air China	0.955	0.968	1.000	0.975	0.964	1.000	1.000	0.954	0.798	1.000	1.000	0.972
All Nippon	0.882	0.959	0.943	0.952	0.878	0.932	1.000	0.978	0.777	0.879	0.781	0.909
Cathay Pacific	0.995	0.995	1.000	0.997	1.000	1.000	0.989	0.989	1.000	0.887	1.000	0.969
China Airlines	1.000	0.854	0.850	0.839	0.901	0.904	0.921	0.914	1.000	1.000	0.898	0.871
China Eastern	1.000	1.000	1.000	0.945	0.993	0.975	1.000	0.952	0.777	0.720	0.866	0.824
China Southern	0.981	0.914	1.000	0.880	0.987	0.915	1.000	1.000	0.956	0.829	1.000	0.832
Eva Air	0.965	0.881	0.916	0.878	1.000	1.000	0.898	0.811	0.982	0.997	0.952	0.805
Hainan	1.000	0.986	1.000	0.933	1.000	1.000	1.000	0.913	0.879	0.809	0.945	1.000
Juneyao	0.993	0.982	1.000	0.941	0.983	0.972	0.967	0.962	0.820	0.925	1.000	0.973
KLM Royal Dutch	1.000	0.991	1.000	1.000	1.000	0.958	0.991	1.000	0.888	1.000	0.497	0.687
Lufthansa	0.898	0.905	1.000	1.000	0.878	0.950	0.913	0.993	0.813	1.000	0.754	0.772
Singapore	1.000	0.963	0.981	1.000	0.977	0.964	1.000	1.000	0.806	1.000	1.000	1.000
Spring	0.952	0.950	0.966	0.891	0.986	0.966	1.000	0.911	0.804	0.868	1.000	0.948
Min	0.820	0.854	0.850	0.757	0.812	0.885	0.898	0.811	0.758	0.538	0.497	0.615
Mean	0.960	0.943	0.971	0.928	0.954	0.959	0.976	0.942	0.861	0.889	0.894	0.870
Std	0.054	0.049	0.043	0.069	0.059	0.036	0.035	0.061	0.085	0.130	0.138	0.116