"Development of this all-new jet with a group of international collaborators continues to progress well," says Bombardier Aerospace president Pierre Beaudoin.
The Canadian company has not indentified its partners on the programme, including engine or avionics suppliers.
Provisionally named the Learjet NXT, the new aircraft will have a stand-up cabin for eight passengers and is being designed for a high-speed cruise of Mach 0.82 and transcontinental range of up to 3,000nm (5,560km).
The aircraft will fit into the product line between the mid-size Learjet 60XR and super mid-size Challenger 300. The updated Learjet 60XR, which recently entered service, has a maximum cruise speed of Mach 0.81 and range of 2,450nm.
The Learjet NXT will provide a larger cabin than any existing mid-size jet, says Bombardier. Competing aircraft include the Cessna Citation Sovereign, Gulfstream G150 and Hawker 900XP.
