MONTREAL -- Air Canada is adding service to more sun destinations on its low cost Rouge subsidiary this spring and summer as it continues to transfer older aircraft from its main fleet.

The airline said Monday that it will be adding new routes from Toronto and Montreal.

Air Canada said Montreal will benefit the most with 36 per cent more seats being available and 20 per cent more flights with the introduction of Rouge flights to resort destinations in Cuba, Mexico and Haiti.

New Rouge destinations from Toronto include Tampa, Fla., Barbados and Nassau.

"The addition of more year-round Caribbean destinations to Air Canada Rouge's network is the next logical step as our leisure carrier enables us to compete on a more cost effective basis on these routes," stated Ben Smith, Air Canada's chief commercial officer.

The growth of Rouge is coming as Air Canada expands its international network as part of its strategy for "sustainable, profitable growth."

Rouge, which launched last summer, expects to expand its workforce to 650 by the end of the year when its number of aircraft increases to 33.

Air Canada's shares lost seven cents at $9.16 in Monday morning trading on the Toronto Stock Exchange.