F9 3511 then DL 4137 at Atlanta
Boston → Atlanta → Shreveport
Timetable, Atlanta time
16:00F9 3511 from Boston at the gate
15:40DL 4137 to Shreveport leaves the gate
23 h 40 apart on the timetable, overnight
DL 4137 leaves 23 h 40 after F9 3511 arrives on the timetable: more than half a day, so not a connection we count.