President Obama is reported to be doing a Jay Leno appearance in Burbank on Wednesday, flying into and out of LAX. How he will travel between Burbank and LAX is unknown at this point. A motorcade could produce a traffic mess on the Westside and near UCLA. Helicopter would avoid it.
Details, such as they are at this point, at:
http://centurycity.patch.com/articles/obama-visits-l-a-wednesday?ncid=newsltuspatc00000001