Originally Posted by
DaveReidUK
Yes, the CSeries is a development of the single-seat homebuilt ...
Or just maybe, BD = Bombardier, the manufacturer.
Yes.
The official type designations for the Global Express family is BD-700-nXnn (differentiated by the nXnn part) and for the Challenger 300/350 is BD-100-1A10 (no discriminating numbers, yet)
BD has been used since the constituent companies were brought together, but the pre-existing types that already had certificates when Bombardier took ownership have retained their original designations, so the original Challenger and the CRJ derivatives are all CL-600-nXxx