Just to be clear, the US Air flight is only labeled "Envoy" since it's coming from Puerto Rico. It isn't actually their Envoy (lie-flight) service. If you're deciding between US Air's domestic FC (which this is) and AA's domestic FC (which I'm assuming, since I'm not an AA expert), I'd go with AA. I haven't flown US Air in several years, but I was Chairman there for 5 or 6 before finally getting out. There is nothing to be desired about their domestic FC service. Unless something has changed on their SJU - PHL routing, that is what you're going to get.