Originally Posted by
TravelerMSY
Irops are pretty directly related to how late in the day you fly. Compare flying only at 5am on a nonstop vs. evening flights with a connection or two and you'll see a big difference
That may be true if your thinking is that first flight in the morning should be on time as the plane has been parked up all night, and that there's also no chance of knock on delays having built up over time.
However, if you fly with an airline that runs round the clock operations it probably makes no difference at all.