MR Help: (question on Routing)
 

1) Does this mean that this fare will allow only one stop, or a stop at any of the above mentioned places?

2) on the NOTE: Why are those cities mentioned when they arent even included in the routing? Can I connect in these cities?

1) It means that you can transit via one (and one only) of the cities mentioned in the middle. Whether you can have a stopover at any of these depends on the rules on stopovers. This is rarely allowed on US domestic fares.
2) This is boiler plate text that is included in the fare rules for fares originating from many cities. It will be relevant for some and not for others. Similarly, routings sometimes allow transit through some cities even though there are no actual flights between the relevant points for the same reason.

I understand that,


so I need to look at Routing, stopovers & transfers?

Could someone define Stopovers & transfers and the difference between them?

I think the OP would be better off just doing an ITA search and specifying the number of segments (i.e. BHM::DL DL DL DL) for four segments from BHM to the destination on Delta. ITA doesn't catch 'em all, but gets most of them and quickly allows you to see the fare that prices out.

On international itineraries, a stopover means that there is an interval of 24 hours or more between arrival and departure at the relevant airport/city. Anything less than 24 hours is regarded as a transfer.
On purely domestic itineraries within the US, a stop-over is normally defined as an interval of 4 hours or more between flights at the relevant airport/city.