As you can probably tell from the freeway flyover ramps in the background (curiously devoid of traffic, as a couple of you pointed out), this is a view of the southeast corner of the airport, specifically the Imperial Cargo Complex, which we shorten to ICC (it's the government; we have to have an acronym or abbreviation). Although several of you noted it right off, a bit of inside knowledge might be required to realize that a FedEx tail isn't typically seen there. After all, FedEx has their own ramp just down the taxiway. The really sharp-eyed among you may even notice that it's not a normal FedEx tail.
The ICC ramp is one of the many areas of the airport that we can't see from the tower. We do, however, have a remote-control camera with a display in the tower cab. Here's a shot of the screen:
Lo and behold, it's a FedEx B777: I was told that this is the first one to appear at LAX. FedEx has two dozen B777s, with more on the way. I've heard that this one may operate between LAX and Honolulu.