Originally Posted by ByeByeDelta

There isn't any pattern I can discern and it actually bugs me quite a bit. I've tried to find previous threads on this topic a couple of times before. A few schedule "changes" I've had, the only thing different was the flight number. Same departure and arrival times, same aircraft, and it didn't become a through flight.

Does time of day play any factors? Maybe flight numbers tie somehow into crew scheduling? I hope someone has the answer, assuming there is one.