OO 6058 then UA 2811 at O'Hare
Sioux City → Chicago → Las Vegas
Timetable, Chicago time
09:24OO 6058 from Sioux City at the gate
09:00UA 2811 to Las Vegas leaves the gate
23 h 36 apart on the timetable, overnight
UA 2811 leaves 23 h 36 after OO 6058 arrives on the timetable: more than half a day, so not a connection we count.