NYC system has a 24 hour schedule, the last I heard.
I think even the London may operate more hours than does the Hong Kong system (the link I found on service hours for H.K. was imprecise, i.e. [approx.] early morning to late at night every day of the year], which at worse comes close to the London hours of service.
Both NYC and London systems are both near one hundred or more years older, which means they are more maintenance intensive. Moreover, the former (and presumably the latter) are comprised of an amalgam of irrationally constructed competing systems that have been only partially made a more rational whole by closures, by new construction and by attempts to connect lines.
I know this does not address the supposed A.I. aspect, but a system built much later has advantages in the tools they employ.