Just use common sense. Our major airline out of MIA dispatched me to
Barranquilla Columbia with Cartagena as an alternate in a 727. Before top of descent about 150 miles found out both were closed due to tailwinds and weather. HF was our only link to dispatch through Lima and they didn't answer so I called Barranquilla ops and said what is Panama City weather? They said VMC so diverted calling ATC and landed with normal fuel. Sometimes you have to do what makes sense. Dispatch was in a panic and said you didn't have fuel for Panama and I said we didn't descend so had reserve fuel. Sweet justice>