F9 4702 then UA 609 at Atlanta
Austin → Atlanta → Denver
Timetable, Atlanta time
19:10F9 4702 from Austin at the gate
16:39UA 609 to Denver leaves the gate
21 h 29 apart on the timetable, overnight
UA 609 leaves 21 h 29 after F9 4702 arrives on the timetable: more than half a day, so not a connection we count.