Quite a collection of piston power. After much research with a Colombian expert, the identity of this C-47 is now known (2021), as are several of the previously unknown FAC Daks. FAC677A turns out to be the former N91379, which was delivered to Colombia circa 1981. I was lucky enough to be able to tour the COTAM ramp allowing for close up shots of that rare DC-7 (FAC923) which was originally BOAC's G-AOIA, although the weather didn't play ball.