Costs

Air superiority fighters:

Aircraft Weight (kg) Unit flyaway cost FY13 USD per kg
F-22 19.700 kg 273 million USD 13 858
F-35C 15.800 kg 236 million USD 14 937
F-35B 14.700 kg 292 million USD 19 864
F-35A 13.300 kg 184 million USD 13 835
F-15C 12.700 kg 126 million USD 9 921
F-15A 12.428 kg 43 million USD 3 460
EF2000 T2 11.285 kg 138 million USD 12 229
Rafale M 10.196 kg 83 million USD 8 140
Rafale C 9.550 kg 75 million USD 7 853
F-16C 8.573 kg 70 million USD 8 165
F-16A 7.076 kg 30 million USD 4 240
Gripen E 7.000 kg 85 million USD 12 143
Gripen C 6.800 kg 44 million USD 6 470
Harrier II Plus 6.340 kg 50 million USD 7 886
Gripen A 6.600 kg 36 million USD 5 455

(Note: neither Rafale or Gripen prices include VAT; with VAT, costs are 100 million USD Rafale M, 90 million USD Rafale C, 100 million USD Gripen E, 53 million USD Gripen C, 43 million USD Gripen A)

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As it can be seen from both table and graphs, cost roughly follows weight despite wildly varying cost-per-kg figures. Stealth aircraft are also more expensive in both total price and cost per kg than non-stealth aircraft; no aircraft on the list comes close to stealth aircraft in former, and only few come close in latter measure. Modern non-stealth aircraft are not much more expensive per kg than older aircraft, only exception being multinational Eurofighter Typhoon and Gripen NG, both of which break 10.000 USD mark. It should be noted that all fighter aircraft weighting less than 8 metric tons cost around 4.000 USD per kg, exceptions being STOVL Harrier II and technology-heavy Gripen E.

CAS fighters and helicopters:

Aircraft Weight (kg) Unit flyaway cost FY13 USD per kg
A-10 11.320 kg 16 million USD 1 413
AH-64 5.662 kg 33 million USD 5 828

Here it can be seen that A-10 is far cheaper than AH-64 despite being heavier and better protected.

Force presence

Air superiority fighters:

Aircraft Unit flyaway cost Aircraft for 1 bln Sorties/day/aircr Sorties/day/1bln
F-22 273 million USD 3 0,5 1,5
F-35C 236 million USD 4 0,5 2
F-35B 292 million USD 3 0,5 (?) 1,5
F-35A 184 million USD 5 0,5 2,5
F-15C 126 million USD 7 1 7
F-15A 43 million USD 23 1 23
EF2000 T2 138 million USD 7 2 14
Rafale M 83 million USD 12 2 24
Rafale C 75 million USD 13 2 26
F-16C 70 million USD 14 1,2 16,8
F-16A 30 million USD 33 1,2 39,6
Gripen E 85 million USD 11 2 22
Gripen C 33 million USD 30 2 60
Harrier II Plus 50 million USD 20 1,2 24
Gripen A 25 million USD 40 2 80

Further reading:

Actual F-35 unit cost