Interesting little bit for those contemplating SQ and *A partners: "If any flight sector with Singapore Airlines is issued in V, Q, G, N or T booking class, the entire flight itinerary will not be eligible for mileage credit," according to an article today by Ed Perkins "On Travel" in a number of newspapers.

As inlanikai suggests, if one is a oneworld person, AA to NRT (with upgrade possibilities to boot) and AA codeshare on JL might be the ticket.