lima has never been true BF service. the only flights to south america with true BF service are brazil flights.

from time to time, CO will serve lima with 752's that have BF seats but never true BF service.

if you look at co.com for lima flights through out the year you will see that some are 752's with Bf seats and some are 752's with normal seats.

therefore, elite customers can upgrade for free just as if it were a domestic flight.

i may be incorrect but i believe the lima flight is the best free upgrade in CO's system.