The billing address is defined as the location where the credit card company sends the statement. The bar above the flights gives you much useful information. Stops' shows the number of stops without change of plane between the cities listed for this leg. A '0' represents a non-stop flight. 2' shows there are two stops with no change.
Meal shows the kind of meal provided.
However, Southwest Airlines, as the low fare leader, does not offer meals on their flights. Under the 'Plane' header is the aircraft type. All of Southwest Airlines aircraft are 733's. You may wonder why we list information that is usually the same or doesn't ever change. The Federal Aviation Authority now mandates all this information be included in all online booking systems.