KBUF_Aviator wrote on May 4^th, 2020 at 8:41pm:

Captain Sim wrote on May 4th, 2020 at 8:05pm: Pablo Go wrote on May 4th, 2020 at 6:37pm: I dont see why you should ask this. Because the -400 exterior (if enough ppl need it) could be out in 2020. The -400 flight deck/systems would take many years even IF we'd drop all other products and start the -400 today. In no disrespect intended, why would it take years? In terms of modeling, the overhead and pedestal are the same. The difference is found in the displays, the EFIS selector being in the location of the Nav frequency tuner on the glare shield, and changes to the gear handle and EGPWS override buttons. All of that can be used from your 777 package. And the systems from understand are the same as the 767, with the expectation of possibly the electric system due to the larger 120kVa generators installed. Unless the flight dynamics are vastly different, I’m curious as to why the 764 will take years but the freighter interior can be completed much quicker then changes to the VC for this variant. I would purchase a 767-400ER if it was fully modeled.

I imagine the differences in development are like going from the 744 to 748. When a well known developer undertook that task even they admitted it was more than expected and should’ve been an entirely new product and not an expansion.