Correct. And in most cases, the stopover will require a higher fare anyway, often significant. I had a recent connection through ORD, where I had to change the date, and was trying at the same time to investigate the cost of taking a flight that arrived early morning into ORD, then leaving ORD on the last flight of the evening. While I could do the change to a connection within 4 hours for just the $150 change fee, the stopover was going to cost $600, owing to the fact that the itinerary was no longer going to be an XXX-ORD-YYY fare, but a XXX-ORD and then ORD-YYY fare.