UA 5979 then FX 1205 at O'Hare
Nashville → Chicago → Memphis
Timetable, Chicago time
20:42UA 5979 from Nashville at the gate
21:20FX 1205 to Memphis leaves the gate
38 min apart on the timetable
The last days
UA 5979 and FX 1205 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.