AV 148 then UA 3757 at Dulles
Bogota → Washington → Buffalo
Timetable, Washington time
04:30AV 148 from Bogota at the gate
17:00UA 3757 to Buffalo leaves the gate
12 h 30 apart on the timetable
UA 3757 leaves 12 h 30 after AV 148 arrives on the timetable: more than half a day, so not a connection we count.