Wirelessly posted (BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
When traveling in Business Class on AA to or from Central America, you are entitled to same-day Admirals Club access at both the origin and destination of your Business Class ticket. So a PTY-MIA J class ticket will give you access at MIA (and at PTY too, if there is a lounge there). No guests, though.
Admirals Club access rules here:
http://www.aa.com/i18n/travelInforma...e=loungeaccess