AAdvantage , SkyMiles or Milage Plus I’m based in Philly so AAmakes sense for domestic but I’m a frequent flyer to Peru. Don’t really travel too much in the US , except once in awhile to south Florida (Miami and FLL) and rapid city . Once in a blue to Boston, but I despise AA. They’re economy is okay but their business class to Lima is a sorry excuse of product. And nothing that co…