UA 1903 then DL 1995 at Houston
Guatemala City → Houston → Atlanta
Timetable, Houston time
17:51UA 1903 from Guatemala City at the gate
16:55DL 1995 to Atlanta leaves the gate
23 h 04 apart on the timetable, overnight
DL 1995 leaves 23 h 04 after UA 1903 arrives on the timetable: more than half a day, so not a connection we count.