Just to address why over the past month the Exec Aisle at LAX has been pretty crappy, I rented a car the first week of April and talked to the agent near the EA and he said that its spring break.
In February I rented a car and they had a great selection SUV's, Crossovers, Mustangs, Convertibles, even a couple Jeep Wrangles with soft cloth tops to remove.
Spring break runs March-April and since many people stayed out of Mexico because of the drug cartel problems, LA was extremely busy.
so check back at a slower time.