Did you pick a specific car type, or was this just randomly assigned to you when you made a reservation and did not select a car type?

I believe this is usually shown for the Prestige Collection vehicles like the Lincoln LS and Volvo S80, but then LAX does have some cars even other Prestige Collection sites don't, like the Jaguar XKR (which this might very well be). When you rent a specific Prestige Collection car, the description is not "Lincoln LS" or such - it's a more generic text line like what you noted.

It might also be the code for the Ford Thunderbird.