UA 339 then AC 3046 at Newark
Santa Clara → New York → Chicago
Timetable, New York time
05:31UA 339 from Santa Clara at the gate
15:30AC 3046 to Chicago leaves the gate
9 h 59 apart on the timetable
The last days
UA 339 and AC 3046 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.