Not sure if this was mentioned yet but a new daily flight (mainline) added the end of this year out of LAX. Info from A.net

Look like it got uploaded into the schedules last night. DL begins daily service between LAX and Costa Rica beginning Dec 19, 2013. Return flight begins Dec 20, 2013.

DL465 - Boeing 757
Dp LAX 10:15pm
Ar SJO 5:55am +1

DL 466 - Boeing 757
Dp SJO 7:10am
Ar LAX 11:30am

Source: ITA schedule search

Another interesting add for DL's LAX operation.