DL 1091 then AA 1854 at San Francisco
Salt Lake City → San Francisco → Chicago O'Hare
Timetable, San Francisco time
23:59DL 1091 from Salt Lake City at the gatealso VS 4542
23:39AA 1854 to Chicago O'Hare leaves the gatealso QF 4325, PD 6392, EI 7107
23 h 40 apart on the timetable, overnight
AA 1854 leaves 23 h 40 after DL 1091 arrives on the timetable: more than half a day, so not a connection we count.