WN 1648 then AA 4629 at Boston
Kansas City → Boston → Philadelphia
Timetable, Boston time
12:25WN 1648 from Kansas City at the gate
15:00AA 4629 to Philadelphia leaves the gate
2 h 35 apart on the timetable
The last days
WN 1648 and AA 4629 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.