Bombardier has chosen Collins Pro Line 4 avionics for its proposed Canadair CRJ-X 70-seat regional jet. Collins Commercial Avionics will also be responsible for systems integration. Pro Line 4 avionics are in service on the 50-seat Canadair Regional Jet (of which the CRJ-X would be a stretched version) and the Challenger 604 business jet.
Source: Flight International