Midwest and Frontier, both recently acquired by Republic Airlines, are expanding their codeshare program internationally and domestically, the airlines announced Tuesday.

Internationally, the codeshare agreement will include San Jose, Costa Rica; and Cabo San Lucas, Cancun, Cozumel, Mazatlan and Puerto Vallarta in Mexico, in addition to Toronto, which already is in place.

The two airlines also will codeshare on every route on the Midwest and Frontier domestic networks.