Don't forget, Boeing owned Canadair for a while - and it turned out to be a huge money pit (IIRC, the total write-off was in excess of $1 Billion US, and that was 30 years ago when the dollar was worth a whole lot more).
Hummm, sounds oddly familiar to the current Bombardier experience with Canadair
I suspect if Bombardier approached Boeing after Boeing previous experience with the aircraft portion of the company, they would have been laughed out of the room...
(or perhaps chased out with pitchforks
)