AA 642 then AA 2151 at O'Hare
Dallas-Fort Worth → Chicago → Nashville
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
20:50AA 2151 to Nashville leaves the gate
7 h 40 apart on the timetable
Today
From the airport’s board at 05:51 Chicago time
13:10AA 642 due at the gate, no estimate yet
20:50AA 2151 due to leave, no estimate yet
7 h 40 between the gates, on these times
The last days
AA 642 and AA 2151 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.