MONTREAL, April 12 (Reuters) - The union representing Canadian Airbus A220 workers said on Friday it reached an agreement-in-principle with the planemaker, with members to vote on the proposed deal on April 21.

The estimated 1,300 Montreal-area assembly workers have rejected two previous offers from Airbus, which wants to ramp up production of the money-losing single-aisle jet. Airbus was not immediately available for comment. (Reporting By Allison Lampert in Montreal; Editing by Leslie Adler)