United Airlines is adding a second-checked-bag fee on flights between North America and Latin America.

As of Feb. 2, travelers at MileagePlus Silver level or lower will pay $30 for their second bag on flights to and from Panama, El Salvador, Colombia, Ecuador and Peru. Additionally, United will charge a $70 second-bag fee on flights to and from Argentina for travel from Nov. 15, 2015 through Jan. 15, 2016.