De Havilland Canada could decide in 2025 whether to launch an updated variant of the Dash 8 turboprop, a move that would see the company shake up a market now largely controlled by competitor ATR.

At first glance, turboprop aircraft like the De Havilland Dash 8-400 may seem destined only for short, quick hops between nearby cities. But Air Canada Express, the regional affiliate of Air Canada, ...