DL 3800 then DL 2797 at Salt Lake City
Great Falls → Salt Lake City → San Antonio
Timetable, Salt Lake City time
19:59DL 3800 from Great Falls at the gate
17:20DL 2797 to San Antonio leaves the gate
21 h 21 apart on the timetable, overnight
DL 2797 leaves 21 h 21 after DL 3800 arrives on the timetable: more than half a day, so not a connection we count.