8XXX flights are added segments, usually appearing the day before.
Talked to the station manager at my commute station today. She said they are applying the cap 10 days prior and then adding segments to overbooked flights. They are not staffing the ground for it, though. One extra segment today is an 11:30pm departure with one revenue pax.
Crazy thing is, they cannot put any more people on the plane than capped seats available. So, for instance, if you have two pilots on the Jumpseats but due to families sitting together in rows you have three completely empty rows, they cannot put another single person on the plane. It's frustrating for commuters and nonrevs. The flight attendant Jumpseat also isn't available right now, so flight attendants are at a distinct disadvantage.