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MIG-31 Foxhound

2.83 Mach

Developed in 1975 to replace the MIG-25, the MIG 31 is a twin-engine, two-seater intercepter capable of surpassing Mach 2.5. To achieve these speeds, the Foxhound sacrificed maneuverability, was difficult to control at low-altitudes, and suffered from engine inefficiency. Technically, the Foxhound could reach Mach 3, but pilots were to hold off at 2.5 to prevent total engine failure. Cost per unit: $60 million.