Originally Posted by
deltaflyer08
One downside I can think of is the time-slot restriction meaning that most likely the new flight's schedule is arriving late at night (9:00 PM, etc.) and the flight back to SFO departing at around 6:00 AM.
A flight departing HND at 6:00 AM will arrive at SFO late in the night, between 10:00 and 11:30 PM depending on the tailwinds and Daylight Saving Time. It's probably too late to connect to anywhere else in the USA. That kind of schedule is strictly for O/D only.