Sorry for the noob question, but here goes. My son is purchasing a RT ticket PEK-SFO in Economy (not BE). If he takes the departing flight but cancels the return prior to its departure, does he retain a flight credit for the value of the return? Some airlines have different rules for flights departing outside the US and the rules are confusing to read. The fare class is N, FBC= KAA4AFBN.

Thanks for your indulgence.