This is a pretty interesting video..

[Wilbur ★]

The story of the Canadair Challenger aircraft.  This was in development before I started flying and it is still a current production aircraft.  The engines have changed, the entry door has, the fuel system has, as have avionics but everything else is the same.  Canadair was sold to Bombardier many years ago as well.

The interesting part for me were working conditions, engineering, plywood mock up for fitting parts, sales techniques etc.  Interesting throwback to  "the good old days".