My guess is that they have a layover till the next day and than return to Miami. Most likely it’s a senior line and when they return home they are off for 2 or 3 days. Or when they return they fly a few short domestic trips before they’re off.
He talks about these routes in his column often. Also, Dick Karl has talked about this in his Gear Up column in FLYING. Dick has gone on ride alongs with Les.