A spokesman for Southwest said Friday that the airline will continue its legal battle for fulltime use of Gate 15 at Love Field. The dueling airlines split access to the gate now.

Southwest, which leases the gate from the city-owned airport, claims Delta is trespassing and interfering with its operations by using the gate.
Delta contends that Southwest, which has sole use of 18 of Love Field’s 20 gates, is unfairly monopolizing the airport.

Southwest operates 180 flights per day at Love Field compared with five by Delta.
The district and appellate court ruled that Delta's chances of winning at trial are strong enough that it should not be squeezed out of the airport before the case goes to trial or is otherwise permanently resolved.
The nationally larger Delta claims that Southwest's lease requires the low-cost carrier to go halfsies with Delta at Gate 15 because Southwest had room when Delta requested use of the gate.

Since that time, Southwest’s demand for gate space has soared, largely due to the elimination of federal flight restrictions on direct flights out of Love Field.

http://www.dallas-lovefield.com/pdf/Terminal_Map.pdf