15000 kg Max. In general, the airplane resembles MiG-25. The fuselage is narrow with pointed nose and very large rectangular air intakes on either side. Twin tail fins are pointed slightly outward. The wings are swept on the leading edge and almost straight on the trailing edge.
Tail plane is swept.
Small fins are located on the lower fuselage underneath the large fins. Rear of the aircraft is dominated by two large engine exhausts. The canopy is small. Landing gear retracts in the fuselage. The development of MiG-31 began in the early 1970's.