AA 5370 then UA 4174 at Charlotte
Des Moines → Charlotte → Washington
Timetable, Charlotte time
14:36AA 5370 from Des Moines at the gate
15:05UA 4174 to Washington leaves the gate
29 min apart on the timetable
The last days
AA 5370 and UA 4174 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.