Ken Borek Air Twin Otters Returning Home?

A couple of Twin Otters just flew over me in Denver, so I looked them up. They're registered to Ken Borek Air. I believe they might be the ones returning from the Antarctic rescue mission last week and on their final leg to Calgary, but I'm missing flight plans for points south of Mexico. Not sure if Flightaware captures those... (flightaware.com) さらに...