If Delta wrote comprehensive rules to cover the ~23 carriers and ~1200 destinations available, and the millions of potential city pairs, many people who are regular posters here would complain it was too complex, and spend far more time complaining about it on FlyerTalk than actually using it.

This forum deals with twenty new threads daily that could be avoided with one minute of thoughtful search on delta.com.

Back to the OP's inquiry, which can be genuinely useful to a sizable group of people.

I believe the International C of C contradicts mtkeller's interpretation of a stopover at domestic points on an international routing.

Stopover
1) Not applicable to travel between Canada and Puerto Rico/Virgin Islands) A stopover will occur when a passenger arrives at an intermediate point and is not scheduled to depart within 24 hours of arrival.

2) (Applicable to travel between Canada and Puerto Rico/Virgin Islands only) A stopover will occur when a passenger arrives at an intermediate or junction transfer point on a flight of the carrier and fails to depart from such intermediate or junction transfer point on:

a) the first flight on which space is available or

b) the flight that will provide for the passenger's earliest arrival at intermediate or junction transfer point(s) or destination point, via the class of service and carrier as shown on the passenger's ticket; provided, however, that in no event will a stopover occur when the passenger departs from the intermediate or junction transfer point on a flight shown
in carrier's official general schedules and/or service patterns as departing within four hours after his arrival at such point.