Production rate since 2024 has hit around 11-12 airframes anually. Given the initial order of roughly 76 jets, with by now over half delivered, it's not as terrible as many make it out to be. What becomes interesting, will be the second order/extension of the contract and how many airframes are to be acquired then. Presumably more, in order to replace the oldest of Flankers while Su-35 and Su-34 fill in the ranks as well. Ultimately it also comes down to the expansion of the construction plant and the suppliers being able to deliver the subsystems and components at a greater rate. I suspect an increase in batch volume is desired at the very latest when the AL-51 goes live.The biggest problem with Su-57 is it's slow production rate, i guess we can't expect Russia to crank them up in J-20 or F-35 numbers, but still merely two or even three dozen Su-57s a year for VKS would be very welcome.