WN 1648 then AA 437 at Boston
Kansas City → Boston → Charlotte
Timetable, Boston time
12:25WN 1648 from Kansas City at the gate
18:51AA 437 to Charlotte leaves the gate
6 h 26 apart on the timetable
The last days
WN 1648 and AA 437 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.