Originally Posted by
3Cforme
... Trying to keep this DL-specific, it seems DL likes to use a single number for some domestic-international and international-domestic (but I'm challenged to find any flight numbers at the moment)
right off the top of my head I can cite the aforementioned 41 (JFK-LAX-SYD) and 588/589 (PVG-SEA-MSP and reverse)