IRKUT provided an interesting PDF today – MC-21-ENG
In the document there are a number of links to videos of the program’s progress.
This reflects a new level of information openness to emerge from IRKUT and is to be commended.  The greater level of transparency, perhaps, demonstrates a growing confidence at IRKUT on their ability to achieve revised timelines. It looks like first flight in the spring is achievable.
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The MC-21 would make a great Boeing 737 replacement. Boeing should build it under license.