AA 1114 then UA 5940 at O'Hare
Las Vegas → Chicago → Tucson
Timetable, Chicago time
05:59AA 1114 from Las Vegas at the gate
19:54UA 5940 to Tucson leaves the gate
13 h 55 apart on the timetable
UA 5940 leaves 13 h 55 after AA 1114 arrives on the timetable: more than half a day, so not a connection we count.