AA 2903 then WN 1501 at Boston
Philadelphia → Boston → Baltimore
Timetable, Boston time
08:40AA 2903 from Philadelphia at the gate
09:10WN 1501 to Baltimore leaves the gate
30 min apart on the timetable
The last days
AA 2903 and WN 1501 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.