AA 2883 then UA 3908 at O'Hare
Salt Lake City → Chicago → Newark
Timetable, Chicago time
11:54AA 2883 from Salt Lake City at the gate
16:15UA 3908 to Newark leaves the gate
4 h 21 apart on the timetable
The last days
AA 2883 and UA 3908 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.