Hi, I was trying to book redemption flights HKG-SFO-SNA round trip flights. There are clearly flights on AA between SFO and SNA. However, CX's reservation system does not show any available flights (though they say UA and US have flights, but no AA flights). Why is that? Is there anyway I can book this (was actually trying to fly to LAX but the HKG-LAX is already full for redemption)?

Thanks.