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Table 4 Yearly distributions of research articles, fuel prices, and evolution of fuel efficiency trends [298]

From: Fuel consumption optimization in air transport: a review, classification, critique, simple meta-analysis, and future research implications

Year No. of Articles Evolution of fuel efficiency trends research trends References Jet fuel prices (dollar/million BTU)
1973 3 Turbojet revolution, fuel burning rate study [102, 103, 281] 0.89
1974 5 Operational efficiency, socioeconomic and political measures, aircraft size [174, 175, 183, 222, 223] 1.54
1975 1 Hydrogen fuel [280] 2.01
1976 7 Turbofan 1st generation, policy measures, Hydrogen fuel, operational efficiency [101, 171173, 220, 221, 279] 2.18
1977 7 Aircraft size, turboprop potential, fuel management model [96100, 170, 278] 2.51
1978 9 Fuel combustion requirement, future turbofan, hydrogen fuel, airport and terminal design, [9295, 168, 169, 275277]; 2.86
1979 2 Engine efficiency, airport capacity [91, 167] 3.85
1980 4 Turbofan 2nd generation, and 3rd generation aircraft design, hydrogen fuel [8890, 274] 6.27
1981 1 Fuel allocation model [166] 7.49
1982 3 Fuel burn estimation [8587] 7.02
1983 1 Hydrogen fuel [182] 6.94
1984 2 Aircraft design, fuel consumption estimation [106, 165] 6.87
1985 1 Turbofan performance estimation [84] 6.51
1986 2 Advance turboprop, Aircraft material potential [82, 83] 4.42
1987 8 Alternative fuels, hydrogen fuel, fuel prices, modern turboprop, optimal cyclic cruise [7981, 107, 219, 270272] 4.55
1988 1 Variable wing camber [78] 4.15
1989 3 Aerodynamic efficiency, fuel properties [77, 268, 269] 4.70
1990 1 Ground efficiency [164] 6.03
1991 2 Hydrogen fuel, terminal area traffic management [163, 267] 5.18
1992 5 Hydrogen fuel, endurance performance optimization, fuel management model, optimum cruise lift [1, 75, 76, 162, 266] 4.84
1993 1 Thermal stability of jet fuel [282] 4.47
1994 5 Fuel properties, taxation policy, fuel consumption modeling [161, 218, 263265] 4.14
1995 2 Policy measures [73, 74] 4.04
1996 5 Wave rotor optimization, hydrogen fuel & fuel properties, engine design [71, 72, 105, 261, 262] 4.88
1997 5 Alternatives fuels & fuel properties, cruise range performance and prediction [70, 257260] 4.53
1998 2 Terminal airdrome, policy measures [69, 160] 3.40
1999 5 Turbofan engine design and flight profile optimization,
incentive based regulations
[6568, 217] 4.23
2000 2 Aircraft turnaround efficiency, chemical kinetic model [159, 256] 6.90
2001 5 Technological and operational efficiency, policy options, turbofan and turbojet engine [20, 63, 158, 216, 255] 5.79
2002 5 Airport infrastructure, technological and operational efficiency, socioeconomic and policy options [7, 19, 157, 214, 215] 5.54
2003 9 Biodiesel and fuel properties, aircraft size, socioeconomic and policy options, engine performance optimization [61, 62, 154156, 213, 252254] 6.76
2004 5 Blended wing body, technological measures, alternative fuels, infrastructure, socioeconomic & policy options [59, 60, 152, 153, 212] 9.06
2005 6 Aircraft design optimization, fuel management model, alternative fuels, operational and socioeconomic & policy measures [57, 58, 150, 151, 211, 251] 13.10
2006 8 Technological and operational efficiency, fuel properties optimization, turbofan engine optimization [55, 56, 113, 114, 148, 149, 249, 250] 14.89
2007 13 Airport infrastructure, alternative fuels & fuel properties, SAGE model, operational efficiency, aircraft size [5254, 143147, 209, 210, 246248] 16.46
2008 12 Hydrogen fuel and fuel properties, operational and technological efficiency, aircraft landing scheduling [4851, 142, 178181, 224, 244, 245] 23.13
2009 13 Socioeconomic & policy measure, alternative fuels & fuel properties, technological and operational efficiency [11, 4247, 137140, 208, 243] 12.64
2010 21 Technological & operational efficiency, Socioeconomic & policy measure, alternative fuels & fuel properties [2, 3, 3741, 104, 134136, 202207, 240242] 16.43
2011 18 Technological & operational efficiency, Socioeconomic & policy measure, alternative fuels & fuel properties [15, 16, 3436, 129133, 199201, 236239] 22.77
2012 16 Technological & operational efficiency, Socioeconomic & policy measure, alternative fuels & fuel properties [10, 32, 33, 123128, 196198, 229, 233235] 24.44
2013 22 Geared turbofan, Technological & operational efficiency, Socioeconomic & policy measure, alternative fuels & fuel properties [13, 2931, 118122, 177, 187195, 228, 231, 232] 23.30
2014 28 Technological & operational efficiency, Socioeconomic & policy measure, alternative fuels & fuel properties [12, 14, 17, 18, 2128, 108112, 115117, 176, 184186, 225227, 230] 22.58
Total 277