DL 5161 then UA 2131 at Atlanta
Montgomery → Atlanta → Washington
Timetable, Atlanta time
20:35DL 5161 from Montgomery at the gate
19:34UA 2131 to Washington leaves the gate
22 h 59 apart on the timetable, overnight
UA 2131 leaves 22 h 59 after DL 5161 arrives on the timetable: more than half a day, so not a connection we count.