I haven't had luck getting a straight answer from the phone reps at AA or UA, but I admit that this is probably pretty obscure and perhaps out of their depth. Thus, I bring it to you (all). Rather than explain it all conceptually, I'll try to do it in terms of specific(ish) examples followed by questions: Scenario: I schedule an award flight, ORD -> LHR outbound and LHR -> JFK(stopover) -> ORD on the return. Question 1: Is it possible to extend my stopover at JFK, and if so what is the dollar cost for the change (no status)? Answers for both AA and UA, please. Question 2: I believe (admitting that I could be wrong) that all legs of an award flight must be flown (not booked) within one year of booking (not flying the first leg). If that is the case, and my stopover extension would cause the final leg to be pushed out beyond that 1 year mark, what is the consequence? Is that leg simply cancelled or is there a provision for this sort of thing? I'm thinking broadly in terms of the "free oneway" strategy and need to know exactly how much flexibility I have on scheduling that final leg and changing that schedule if/when necessary. Thanks in advance.