How many Mig-31 airframes that are still good for further upgrades ??? They are starting to get old, last batch ended in 1994, it's 30 years ago. Sure that these airframes don't take G in dogfighting training like others but they surely beginning to have less place to drill holes for new equipments.They have been working on a prototype MiG-31 with fly-by-wire. So I wouldn't be surprised if MiG made yet another upgrade to the existing airframes. The MiG-31BM upgrade package is a decade old at this point and was based on components from the MiG-29SMT. They could be making another upgrade package which would add systems developed for the MiG-35 to the MiG-31.
PAK DP it is supposed to use an Al-51 engine variant. Given that the original AL-51 hasn't entered serial production yet I doubt the engine will be available soon. The PAK DP engine is supposed to be an Al-51 engine core with a modified afterburner and maybe also modified low pressure section.
The PAK DP aircraft will likely be Mach 3 capable. And should be able to fire hypersonic cruise missiles. Which could be an air launched variant of the Zircon.
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