Originally Posted by jrl767

4- in mentally revisiting similar questions about “named” flights of this era, I can only associate a few airlines with the practice, and one of those (United) wasn’t flying to any southern states from NYC ... “Southernaire” doesn’t sound like anything that National would have chosen (iirc they favored monikers like “Flamingo”), so I’m going to guess that the operator was Capital Airlines ... which certainly implies that the aircraft was a Viscount

as for the route, perhaps Newark (EWR) - Birmingham (BHM) - New Orleans (MSY)