AA 4429 then AA 1776 at Philadelphia
Grand Rapids → Philadelphia → Boston
Timetable, Philadelphia time
15:08AA 4429 from Grand Rapids at the gate
18:38AA 1776 to Boston leaves the gate
3 h 30 apart on the timetable
The last days
AA 4429 and AA 1776 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.