Air Canada flew its A321XLR 336 miles. The airplane was built for 5,400.

AC413 lifted off Montreal and touched down in Toronto 90 minutes later. One hundred and eighty-two passengers, 336 nautical miles, and the most range-optimized narrowbody ever certified barely broke a sweat.

Read that flight as a disappointment and you've missed the story entirely.

The A321XLR wasn't built for this. It was built for the routes that break widebody economics — secondary European city pairs where a 767 flies half-full and an A321neo runs out of fuel somewhere over Greenland. Think Montreal to Edinburgh. Toronto to Porto. Routes thin enough that a twin-aisle is financial surgery, but long enough that the standard narrowbody family simply cannot reach.

The engineering that makes this possible sits behind the rear pressure bulkhead. Airbus integrated a rear centre-of-gravity fuel tank — the RCT — directly into the fuselage structure, adding roughly 2,700 lb of additional fuel capacity over the A321neo LR. That single architectural decision pushed usable range to approximately 4,700 nautical miles. Iberia proved the concept in 2024, opening transatlantic service as the type's launch operator.

So why Toronto? Because airlines never cold-start a new airframe on the route it was designed for. Crews need line experience. Maintenance teams need hands-on familiarity. And Air Canada's new 'Glowing Hearted' cabin — debuting on this aircraft — needs real passengers before it faces a seven-hour crossing. Montreal-Toronto is a controlled environment, not a destination.

The domestic hop is the shakedown. The Atlantic is the assignment.

Somewhere in Air Canada's network planning, a city pair exists that a widebody can't justify and a standard narrowbody can't reach — and this airplane was built to close that gap.