Originally Posted by flightline

If I search for the flight as part of a connecting itinerary, however, I get very different availability. It even differs depending on which flight I choose inbound to ATL.

See the following for example. DL1652 show 4 Y seats in the first two options, and 8 Y seats and 2 F seats in the third option. Again, this is the flight that showed 1 Y seat in the above search.

Any idea why?