Originally Posted by
andreadbc
I've probably had bad luck with agents that are all-rules then

In any case, I would recommend always asking!
Sorry Andrea, not deliberately being contrary to you, you are quite right, LAN agents are by the book and
will enforce the fares rules... especially for us on Base Fares

... but this is a gringo on BA award tix LIM-CUZ. With all those internationals arriving / departing late / early with hoards of folks on high fares eager to see or leave MP and with 17 flights a day, and with possible bad weather, LAN has been known to accommodate pax on this route.
But I will rephrase: OP check your fare rules, LAN will follow them to the letter, but on this route there
may be flexibility if you ask and it is convenient to Lan.