KL 668 then KL 1297 at Schiphol
Austin → Amsterdam → Billund
Timetable, Amsterdam time
10:25KL 668 from Austin at the gate
14:20KL 1297 to Billund leaves the gate
3 h 55 apart on the timetable
The last days
KL 668 and KL 1297 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.