How Many Bags Can I Take?

DELTA allows 2 bags free 50lbs or less (There has been talk that the most recent info is ONLY 1 BAG IS FREE)
UNITED allows 1 bag free, 2nd bag $30
COPA allows 2 bags combined weight 70 lbs or less

Double check at the following links:

http://www.delta.com/traveling_checkin/baggage/checked/index.jsp#intl

http://www.copaair.com/Sites/CC/EN/Informacion-de-viaje/Pages/Condiciones-Generales-de-Equipaje.aspx

http://www.united.com/page/article/0,6867,52482,00.html