PHL for sure. The only tricky part will be getting from terminal A West ( to AA Int'l) to Terminal E (Southwest). You'll need to clear immigration/customs, which obviously puts you landslide. The best way to go between terminals is to hope on the PHL Economy Parking bus (blue with electronic "Economy Parking " sign over front window) at A West and just get off at Terminal E while other people are getting on. It's quite a hike outside if you don't. With all that said, JFK-LGA cannot be a fun trip under the best of situations. Plus, LGA is the worst airport I've ever been to and I'd avoid it at all costs.