I'm searching for return flights from southeast Asia at the end of the summer and having trouble finding (for instance) BKK-NYC. However, I can find BKK-ORD on the BA site using Japan Airlines via NRT. On the AA site I can find low-cost availability ORD-LGA (change in MSP) three hours after the Japan Airlines flight arrives in ORD. If I call AA and feed them the flight numbers can these four segments be combined into a single one way award? Would it be better to get them as part of a round-trip?