UA 1138 then DL 9728 at LAX
Guatemala City → Los Angeles → Tucson
Timetable, Los Angeles time
06:00UA 1138 from Guatemala City at the gate
21:00DL 9728 to Tucson leaves the gate
15 h apart on the timetable
DL 9728 leaves 15 h after UA 1138 arrives on the timetable: more than half a day, so not a connection we count.