By: Simon Hradecky

A Trans States Airlines Embraer ERJ-145 on behalf of American Airlines, registration N623AE performing flight AX-4151/AA-4151 from Montreal,QC (Canada) to New York La Guardia,NY (USA) with 25 passengers and 3 crew, was in the initial climb out of Montreal when the crew declared emergency reporting smoke in the cockpit. The crew stopped the climb at about 2500 feet and returned to Montreal for a safe landing about 10 minutes after departure. The Canadian TSB reported maintenance identified a failed Air Cycle Machine as cause of the smoke.