BA 1524 then EC 9682 at Barcelona
Chicago → Barcelona → Lisbon
Timetable, Barcelona time
09:50BA 1524 from Chicago at the gatealso AY 3828, IB 4382
15:00EC 9682 to Lisbon leaves the gatealso U2 9682
5 h 10 apart on the timetable
The last days
BA 1524 and EC 9682 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.